diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,15 @@
+# Version 0.9
+
+* BACKWARDS COMPATIBLE COMPILER ASSISTED CHANGE: The `Show`, `Read`,
+  `Eq`, `Ord` and `Generic` instances now live in the `exinst-base` package.
+  This is so that `exinst` doesn't need to depend on the large
+  `singletons-base`. Users wanting access to those instances need to import
+  `Exinst.Base` explicitly.
+
+* Builds with GHC 9.4.
+
+* The tests for `exinst` now live in `exinst-base`.
+
 # Version 0.8
 
 * Builds with GHC 8.10 and `singletons-2.7`.
diff --git a/exinst.cabal b/exinst.cabal
--- a/exinst.cabal
+++ b/exinst.cabal
@@ -1,5 +1,5 @@
 name:                exinst
-version:             0.8
+version:             0.9
 author:              Renzo Carbonara
 maintainer:          renλren!zone
 copyright:           Renzo Carbonara 2015
@@ -8,7 +8,7 @@
 extra-source-files:  README.md CHANGELOG.md
 category:            Data
 build-type:          Simple
-cabal-version:       >=1.18
+cabal-version:       1.18
 synopsis:            Dependent pairs and their instances.
 homepage:            https://github.com/k0001/exinst
 bug-reports:         https://github.com/k0001/exinst/issues
@@ -23,7 +23,6 @@
       Exinst.Internal
       Exinst.Internal.Product
       Exinst.Internal.Sum
-      Exinst.Base
       Exinst.Binary
       Exinst.DeepSeq
       Exinst.Hashable
@@ -35,77 +34,7 @@
     , deepseq
     , hashable
     , profunctors >=5.0
-    , singletons >=2.6
+    , singletons >= 3.0
     , QuickCheck
   ghcjs-options: -Wall -O3
   ghc-options: -Wall -O2
-
---  if flag(bytes)
---    build-depends: bytes >=0.15
---    other-modules: Exinst.Instances.Bytes
---    cpp-options: -DHAS_bytes
---  if flag(cereal) || flag(bytes)
---    build-depends: cereal
---    other-modules: Exinst.Instances.Cereal
---    cpp-options: -DHAS_cereal
---  if flag(serialise)
---    build-depends: cborg, serialise
---    other-modules: Exinst.Instances.Serialise
---    cpp-options: -DHAS_serialise
-
-test-suite tests
-  default-language: Haskell2010
-  type: exitcode-stdio-1.0
-  hs-source-dirs: tests
-  main-is: Main.hs
-  build-depends:
-     base
-   , binary
-   , bytestring
-   , constraints
-   , deepseq
-   , exinst
-   , hashable
-   , profunctors
-   , QuickCheck
-   , singletons
-   , tasty
-   , tasty-hunit
-   , tasty-quickcheck
-  ghcjs-options: -Wall -O0
-  ghc-options: -Wall -O0
---   cpp-options:
---     -DHAS_quickcheck
---   if flag(bytes)
---     build-depends: bytes
---     cpp-options: -DHAS_bytes
---   if flag(cereal) || flag(bytes)
---     build-depends: cereal
---     cpp-options: -DHAS_cereal
---   if flag(hashable)
---     build-depends: hashable
---     cpp-options: -DHAS_hashable
---   if flag(serialise)
---     build-depends: cborg, serialise
---     cpp-options: -DHAS_serialise
---
--- flag bytes
---   description: Provide instances for @bytes@ (implies @ceral@ and @binary@).
---   default: True
---   manual: True
--- flag cereal
---   description: Provide instances for @cereal@.
---   default: True
---   manual: True
--- flag hashable
---   description: Provide instances for @hashable@
---   default: True
---   manual: True
--- flag quickcheck
---   description: Provide instances for @QuickCheck@
---   default: True
---   manual: True
--- flag serialise
---   description: Provide instances for @serialise@
---   default: True
---   manual: True
diff --git a/lib/Exinst.hs b/lib/Exinst.hs
--- a/lib/Exinst.hs
+++ b/lib/Exinst.hs
@@ -117,7 +117,6 @@
 import Exinst.Internal.Product
 import Exinst.Internal.Sum
 
-import Exinst.Base ()
 import Exinst.Binary ()
 import Exinst.DeepSeq ()
 import Exinst.Hashable ()
@@ -377,9 +376,7 @@
 related to the singleton type used as a type-index for @f@.
 
 The @Exinst@ module exports ready-made instances for 'Some1', 'Some2', 'Some3'
-and 'Some4' (they can be enabled or disabled with some cabal flags).
-
-* 'Eq', 'Ord', 'Show' from the @base@ package.
+and 'Some4'.
 
 * 'Data.Binary.Binary' from the @binary@ package.
 
@@ -391,6 +388,11 @@
 
 Furthermore, other libraries export other orphan instances for the datatypes
 exported by 'exinst':
+
+* [exinst-base](https://hackage.haskell.org/package/exinst-aeson) exports
+instances for 'Show', 'Read', 'Eq', 'Ord' and 'Generic' from the @base@
+package. Depends on the large @singleton-base@ package, that's why
+these instances are not in the @exinst@ package itself.
 
 * [exinst-aeson](https://hackage.haskell.org/package/exinst-aeson) exports
 instances for 'Data.Aeson.FromJSON' and 'Data.Aeson.ToJSON' from the @aeson@
diff --git a/lib/Exinst/Base.hs b/lib/Exinst/Base.hs
deleted file mode 100644
--- a/lib/Exinst/Base.hs
+++ /dev/null
@@ -1,621 +0,0 @@
-{-# LANGUAGE ConstraintKinds #-}
-{-# LANGUAGE DataKinds #-}
-{-# LANGUAGE FlexibleInstances #-}
-{-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE MultiParamTypeClasses #-}
-{-# LANGUAGE PolyKinds #-}
-{-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE TypeFamilies #-}
-{-# LANGUAGE TypeOperators #-}
-{-# LANGUAGE TypeInType #-}
-{-# LANGUAGE UndecidableInstances #-}
-
-{-# OPTIONS_GHC -fno-warn-orphans #-}
-
--- | This module exports 'Show', 'Eq' and 'Ord' instances for 'Exinst.Some1',
--- 'Exinst.Some2', 'Exinst.Some3' and 'Exinst.Some4' from "Exinst", provided situable
--- 'Dict1', 'Dict2', 'Dict3' and 'Dict4' instances are available.
---
--- See the README file for more general documentation: https://hackage.haskell.org/package/exinst#readme
-module Exinst.Base () where
-
-import Data.Constraint
-import Data.Kind (Type)
-import Data.Singletons
-import Data.Singletons.Prelude.Enum (PEnum(EnumFromTo), PBounded(MinBound, MaxBound))
-import Data.Singletons.Prelude.Bool (SBool(STrue, SFalse))
-import qualified Data.Singletons.Prelude.List as List
-import Data.Singletons.Prelude.Tuple (Tuple2Sym1)
-import Data.Singletons.Decide
-import qualified GHC.Generics as G
-import Prelude
-import qualified Text.Read as Read
-
-import Exinst.Internal
-  hiding (Some1(..), Some2(..), Some3(..), Some4(..))
-import qualified Exinst.Internal as Exinst
-
---------------------------------------------------------------------------------
--- Show
-
--- Internal wrappers used to avoid writing the string manipulation in 'Show'.
-data Some1'Show r1 x = Some1 r1 x deriving (Show)
-data Some2'Show r2 r1 x = Some2 r2 r1 x deriving (Show)
-data Some3'Show r3 r2 r1 x = Some3 r3 r2 r1 x deriving (Show)
-data Some4'Show r4 r3 r2 r1 x = Some4 r4 r3 r2 r1 x deriving (Show)
-
-instance forall k1 (f :: k1 -> Type)
-  . ( SingKind k1
-    , Show (Demote k1)
-    , Dict1 Show f
-    ) => Show (Exinst.Some1 f)
-  where
-    {-# INLINABLE showsPrec #-}
-    showsPrec n = \some1x -> withSome1Sing some1x $ \sa1 (x :: f a1) ->
-       case dict1 sa1 :: Dict (Show (f a1)) of
-          Dict -> showsPrec n (Some1 (fromSing sa1) x)
-
-instance forall k2 k1 (f :: k2 -> k1 -> Type)
-  . ( SingKind k2
-    , SingKind k1
-    , Show (Demote k2)
-    , Show (Demote k1)
-    , Dict2 Show f
-    ) => Show (Exinst.Some2 f)
-  where
-    {-# INLINABLE showsPrec #-}
-    showsPrec n = \some2x -> withSome2Sing some2x $ \sa2 sa1 (x :: f a2 a1) ->
-       case dict2 sa2 sa1 :: Dict (Show (f a2 a1)) of
-          Dict -> showsPrec n (Some2 (fromSing sa2) (fromSing sa1) x)
-
-instance forall k3 k2 k1 (f :: k3 -> k2 -> k1 -> Type)
-  . ( SingKind k3
-    , SingKind k2
-    , SingKind k1
-    , Show (Demote k3)
-    , Show (Demote k2)
-    , Show (Demote k1)
-    , Dict3 Show f
-    ) => Show (Exinst.Some3 f)
-  where
-    {-# INLINABLE showsPrec #-}
-    showsPrec n = \some3x -> withSome3Sing some3x $ \sa3 sa2 sa1 (x :: f a3 a2 a1) ->
-       case dict3 sa3 sa2 sa1 :: Dict (Show (f a3 a2 a1)) of
-          Dict -> showsPrec n (Some3 (fromSing sa3) (fromSing sa2) (fromSing sa1) x)
-
-instance forall k4 k3 k2 k1 (f :: k4 -> k3 -> k2 -> k1 -> Type)
-  . ( SingKind k4
-    , SingKind k3
-    , SingKind k2
-    , SingKind k1
-    , Show (Demote k4)
-    , Show (Demote k3)
-    , Show (Demote k2)
-    , Show (Demote k1)
-    , Dict4 Show f
-    ) => Show (Exinst.Some4 f)
-  where
-    {-# INLINABLE showsPrec #-}
-    showsPrec n = \some4x -> withSome4Sing some4x $ \sa4 sa3 sa2 sa1 (x :: f a4 a3 a2 a1) ->
-       case dict4 sa4 sa3 sa2 sa1 :: Dict (Show (f a4 a3 a2 a1)) of
-          Dict -> showsPrec n (Some4 (fromSing sa4) (fromSing sa3)
-                                     (fromSing sa2) (fromSing sa1) x)
-
---------------------------------------------------------------------------------
--- Read
-
-instance forall k1 (f :: k1 -> Type)
-  . ( SingKind k1
-    , Read (Demote k1)
-    , Dict1 Read f
-    ) => Read (Exinst.Some1 f)
-  where
-    {-# INLINABLE readPrec #-}
-    readPrec = do
-      Read.Ident "Some1" <- Read.lexP
-      rsa1 <- Read.readPrec
-      withSomeSing rsa1 $ \(sa1 :: Sing (a1 :: k1)) ->
-         case dict1 sa1 :: Dict (Read (f a1)) of
-            Dict -> do
-               x :: f a1 <- Read.readPrec
-               pure (Exinst.Some1 sa1 x)
-
-instance forall k2 k1 (f :: k2 -> k1 -> Type)
-  . ( SingKind k2
-    , SingKind k1
-    , Read (Demote k2)
-    , Read (Demote k1)
-    , Dict2 Read f
-    ) => Read (Exinst.Some2 f)
-  where
-    {-# INLINABLE readPrec #-}
-    readPrec = do
-      Read.Ident "Some2" <- Read.lexP
-      rsa2 <- Read.readPrec
-      rsa1 <- Read.readPrec
-      withSomeSing rsa2 $ \(sa2 :: Sing (a2 :: k2)) ->
-         withSomeSing rsa1 $ \(sa1 :: Sing (a1 :: k1)) ->
-            case dict2 sa2 sa1 :: Dict (Read (f a2 a1)) of
-               Dict -> do
-                  x :: f a2 a1 <- Read.readPrec
-                  pure (Exinst.Some2 sa2 sa1 x)
-
-instance forall k3 k2 k1 (f :: k3 -> k2 -> k1 -> Type)
-  . ( SingKind k3
-    , SingKind k2
-    , SingKind k1
-    , Read (Demote k3)
-    , Read (Demote k2)
-    , Read (Demote k1)
-    , Dict3 Read f
-    ) => Read (Exinst.Some3 f)
-  where
-    {-# INLINABLE readPrec #-}
-    readPrec = do
-      Read.Ident "Some3" <- Read.lexP
-      rsa3 <- Read.readPrec
-      rsa2 <- Read.readPrec
-      rsa1 <- Read.readPrec
-      withSomeSing rsa3 $ \(sa3 :: Sing (a3 :: k3)) ->
-         withSomeSing rsa2 $ \(sa2 :: Sing (a2 :: k2)) ->
-            withSomeSing rsa1 $ \(sa1 :: Sing (a1 :: k1)) ->
-               case dict3 sa3 sa2 sa1 :: Dict (Read (f a3 a2 a1)) of
-                  Dict -> do
-                     x :: f a3 a2 a1 <- Read.readPrec
-                     pure (Exinst.Some3 sa3 sa2 sa1 x)
-
-instance forall k4 k3 k2 k1 (f :: k4 -> k3 -> k2 -> k1 -> Type)
-  . ( SingKind k4
-    , SingKind k3
-    , SingKind k2
-    , SingKind k1
-    , Read (Demote k4)
-    , Read (Demote k3)
-    , Read (Demote k2)
-    , Read (Demote k1)
-    , Dict4 Read f
-    ) => Read (Exinst.Some4 f)
-  where
-    {-# INLINABLE readPrec #-}
-    readPrec = do
-      Read.Ident "Some4" <- Read.lexP
-      rsa4 <- Read.readPrec
-      rsa3 <- Read.readPrec
-      rsa2 <- Read.readPrec
-      rsa1 <- Read.readPrec
-      withSomeSing rsa4 $ \(sa4 :: Sing (a4 :: k4)) ->
-         withSomeSing rsa3 $ \(sa3 :: Sing (a3 :: k3)) ->
-            withSomeSing rsa2 $ \(sa2 :: Sing (a2 :: k2)) ->
-               withSomeSing rsa1 $ \(sa1 :: Sing (a1 :: k1)) ->
-                  case dict4 sa4 sa3 sa2 sa1 :: Dict (Read (f a4 a3 a2 a1)) of
-                     Dict -> do
-                        x :: f a4 a3 a2 a1 <- Read.readPrec
-                        pure (Exinst.Some4 sa4 sa3 sa2 sa1 x)
-
---------------------------------------------------------------------------------
--- Eq
-
-instance forall k1 (f :: k1 -> Type).
-  ( SDecide k1
-  , Dict1 Eq f
-  ) => Eq (Exinst.Some1 f)
-  where
-  {-# INLINABLE (==) #-}
-  (==) = \som1x som1y ->
-     withSome1Sing som1x $ \sa1x (x :: f a1x) ->
-        withSome1Sing som1y $ \sa1y (y :: f a1y) ->
-           maybe False id $ do
-              Refl <- decideEquality sa1x sa1y
-              case dict1 sa1x :: Dict (Eq (f a1x)) of
-                 Dict -> Just (x == y)
-
-instance forall k2 k1 (f :: k2 -> k1 -> Type)
-  . ( SDecide k2
-    , SDecide k1
-    , Dict2 Eq f
-    ) => Eq (Exinst.Some2 f)
-  where
-    {-# INLINABLE (==) #-}
-    (==) = \som2x som2y ->
-       withSome2Sing som2x $ \sa2x sa1x (x :: f a2x a1x) ->
-          withSome2Sing som2y $ \sa2y sa1y (y :: f a2y a1y) ->
-             maybe False id $ do
-                Refl <- decideEquality sa2x sa2y
-                Refl <- decideEquality sa1x sa1y
-                case dict2 sa2x sa1x :: Dict (Eq (f a2x a1x)) of
-                   Dict -> Just (x == y)
-
-instance forall k3 k2 k1 (f :: k3 -> k2 -> k1 -> Type)
-  . ( SDecide k3
-    , SDecide k2
-    , SDecide k1
-    , Dict3 Eq f
-    ) => Eq (Exinst.Some3 f)
-  where
-    {-# INLINABLE (==) #-}
-    (==) = \som3x som3y ->
-       withSome3Sing som3x $ \sa3x sa2x sa1x (x :: f a3x a2x a1x) ->
-          withSome3Sing som3y $ \sa3y sa2y sa1y (y :: f a3y a2y a1y) ->
-             maybe False id $ do
-                Refl <- decideEquality sa3x sa3y
-                Refl <- decideEquality sa2x sa2y
-                Refl <- decideEquality sa1x sa1y
-                case dict3 sa3x sa2x sa1x :: Dict (Eq (f a3x a2x a1x)) of
-                   Dict -> Just (x == y)
-
-instance forall k4 k3 k2 k1 (f :: k4 -> k3 -> k2 -> k1 -> Type)
-  . ( SDecide k4
-    , SDecide k3
-    , SDecide k2
-    , SDecide k1
-    , Dict4 Eq f
-    ) => Eq (Exinst.Some4 f)
-  where
-    {-# INLINABLE (==) #-}
-    (==) = \som4x som4y ->
-       withSome4Sing som4x $ \sa4x sa3x sa2x sa1x (x :: f a4x a3x a2x a1x) ->
-          withSome4Sing som4y $ \sa4y sa3y sa2y sa1y (y :: f a4y a3y a2y a1y) ->
-             maybe False id $ do
-                Refl <- decideEquality sa4x sa4y
-                Refl <- decideEquality sa3x sa3y
-                Refl <- decideEquality sa2x sa2y
-                Refl <- decideEquality sa1x sa1y
-                case dict4 sa4x sa3x sa2x sa1x :: Dict (Eq (f a4x a3x a2x a1x)) of
-                   Dict -> Just (x == y)
-
---------------------------------------------------------------------------------
--- Ord
-
-instance forall k1 (f :: k1 -> Type)
-  . ( SingKind k1
-    , SDecide k1
-    , Ord (Demote k1)
-    , Dict1 Ord f
-    , Eq (Exinst.Some1 f)
-    ) => Ord (Exinst.Some1 f)
-  where
-    {-# INLINABLE compare #-}
-    compare = \som1x som1y ->
-       withSome1Sing som1x $ \sa1x (x :: f a1x) ->
-          withSome1Sing som1y $ \sa1y (y :: f a1y) ->
-             let termCompare = compare (fromSing sa1x) (fromSing sa1y)
-             in maybe termCompare id $ do
-                  Refl <- decideEquality sa1x sa1y
-                  case dict1 sa1x :: Dict (Ord (f a1x)) of
-                     Dict -> Just (compare x y)
-
-instance forall k2 k1 (f :: k2 -> k1 -> Type)
-  . ( SingKind k2
-    , SingKind k1
-    , SDecide k2
-    , SDecide k1
-    , Ord (Demote k2)
-    , Ord (Demote k1)
-    , Dict2 Ord f
-    , Eq (Exinst.Some2 f)
-    ) => Ord (Exinst.Some2 f)
-  where
-    {-# INLINABLE compare #-}
-    compare = \som2x som2y ->
-       withSome2Sing som2x $ \sa2x sa1x (x :: f a2x a1x) ->
-          withSome2Sing som2y $ \sa2y sa1y (y :: f a2y a1y) ->
-             let termCompare = compare (fromSing sa2x, fromSing sa1x)
-                                       (fromSing sa2y, fromSing sa1y)
-             in maybe termCompare id $ do
-                   Refl <- decideEquality sa2x sa2y
-                   Refl <- decideEquality sa1x sa1y
-                   case dict2 sa2x sa1x :: Dict (Ord (f a2x a1x)) of
-                      Dict -> Just (compare x y)
-
-instance forall k3 k2 k1 (f :: k3 -> k2 -> k1 -> Type)
-  . ( SingKind k3
-    , SingKind k2
-    , SingKind k1
-    , SDecide k3
-    , SDecide k2
-    , SDecide k1
-    , Ord (Demote k3)
-    , Ord (Demote k2)
-    , Ord (Demote k1)
-    , Dict3 Ord f
-    , Eq (Exinst.Some3 f)
-    ) => Ord (Exinst.Some3 f)
-  where
-    {-# INLINABLE compare #-}
-    compare = \som3x som3y ->
-       withSome3Sing som3x $ \sa3x sa2x sa1x (x :: f a3x a2x a1x) ->
-          withSome3Sing som3y $ \sa3y sa2y sa1y (y :: f a3y a2y a1y) ->
-             let termCompare = compare
-                   (fromSing sa3x, fromSing sa2x, fromSing sa1x)
-                   (fromSing sa3y, fromSing sa2y, fromSing sa1y)
-             in maybe termCompare id $ do
-                  Refl <- decideEquality sa3x sa3y
-                  Refl <- decideEquality sa2x sa2y
-                  Refl <- decideEquality sa1x sa1y
-                  case dict3 sa3x sa2x sa1x :: Dict (Ord (f a3x a2x a1x)) of
-                     Dict -> Just (compare x y)
-
-instance forall k4 k3 k2 k1 (f :: k4 -> k3 -> k2 -> k1 -> Type)
-  . ( SingKind k4
-    , SingKind k3
-    , SingKind k2
-    , SingKind k1
-    , SDecide k4
-    , SDecide k3
-    , SDecide k2
-    , SDecide k1
-    , Ord (Demote k4)
-    , Ord (Demote k3)
-    , Ord (Demote k2)
-    , Ord (Demote k1)
-    , Dict4 Ord f
-    , Eq (Exinst.Some4 f)
-    ) => Ord (Exinst.Some4 f)
-  where
-    {-# INLINABLE compare #-}
-    compare = \som4x som4y ->
-       withSome4Sing som4x $ \sa4x sa3x sa2x sa1x (x :: f a4x a3x a2x a1x) ->
-          withSome4Sing som4y $ \sa4y sa3y sa2y sa1y (y :: f a4y a3y a2y a1y) ->
-             let termCompare = compare
-                   (fromSing sa4x, fromSing sa3x, fromSing sa2x, fromSing sa1x)
-                   (fromSing sa4y, fromSing sa3y, fromSing sa2y, fromSing sa1y)
-             in maybe termCompare id $ do
-                  Refl <- decideEquality sa4x sa4y
-                  Refl <- decideEquality sa3x sa3y
-                  Refl <- decideEquality sa2x sa2y
-                  Refl <- decideEquality sa1x sa1y
-                  case dict4 sa4x sa3x sa2x sa1x :: Dict (Ord (f a4x a3x a2x a1x)) of
-                     Dict -> Just (compare x y)
-
---------------------------------------------------------------------------------
--- Generic
-
-type Eithers1 (f :: k1 -> Type) =
-  Eithers1' (EnumFromTo (MinBound :: k1) (MaxBound :: k1)) f
-
--- | TODO: Mak1e this logarithmic.
-type family Eithers1' (xs :: [k1]) (f :: k1 -> Type) :: Type where
-  Eithers1' (x ': '[]) f = f x
-  Eithers1' (x ': xs)  f = Either (f x) (Eithers1' xs f)
-
-instance forall k1 (f :: k1 -> Type)
-  . ( SingKind k1
-    , PEnum (Demote k1)
-    , PBounded (Demote k1)
-    , G.Generic (Demote k1)
-    , Dict1 G.Generic f
-    , Dict1 (Inj (Eithers1 f)) f
-    ) => G.Generic (Exinst.Some1 f)
-  where
-    type Rep (Exinst.Some1 (f :: k1 -> Type)) =
-      G.Rep (Demote k1, Eithers1 f)
-    {-# INLINABLE from #-}
-    from = \s1x -> withSome1Sing s1x $ \sa1 (x :: f a1) ->
-      case dict1 sa1 :: Dict (G.Generic (f a1)) of
-        Dict -> case dict1 sa1 :: Dict (Inj (Eithers1 f) (f a1)) of
-          Dict -> G.from (fromSing sa1, inj x)
-    {-# INLINABLE to #-}
-    to = \(G.M1 (G.M1 (G.M1 (G.K1 da1) G.:*: G.M1 (G.K1 ex)))) ->
-      withSomeSing da1 $ \(sa1 :: Sing (a1 :: k1)) ->
-        case dict1 sa1 :: Dict (Inj (Eithers1 f) (f a1)) of
-          Dict -> case prj ex of
-            Just x -> Exinst.Some1 sa1 (x :: f a1)
-            Nothing -> error "Generic Some1: Malformed Rep"
-
----
-type Eithers2 (f :: k2 -> k1 -> Type) =
-  Eithers2' (Cartesian2 (EnumFromTo (MinBound :: k2) (MaxBound :: k2))
-                        (EnumFromTo (MinBound :: k1) (MaxBound :: k1))) f
-
--- | TODO: Mak1e this logarithmic.
-type family Eithers2' (xs :: [(k2, k1)]) (f :: k2 -> k1 -> Type) :: Type where
-  Eithers2' ( '(x2, x1) ': '[]) f = f x2 x1
-  Eithers2' ( '(x2, x1) ': xs)  f = Either (f x2 x1) (Eithers2' xs f)
-
-type family Cartesian2 (xs2 :: [k2]) (xs1 :: [k1]) :: [(k2,k1)] where
-  Cartesian2 '[] xs1 = '[]
-  Cartesian2 (x2 ': xs2) xs1 =
-    List.Concat [List.Map (Tuple2Sym1 x2) xs1, Cartesian2 xs2 xs1]
-
-
-instance forall k2 k1 (f :: k2 -> k1 -> Type)
-  . ( SingKind k2
-    , SingKind k1
-    , PEnum (Demote k2)
-    , PEnum (Demote k1)
-    , PBounded (Demote k2)
-    , PBounded (Demote k1)
-    , G.Generic (Demote k2)
-    , G.Generic (Demote k1)
-    , Dict2 G.Generic f
-    , Dict2 (Inj (Eithers2 f)) f
-    ) => G.Generic (Exinst.Some2 f)
-  where
-    type Rep (Exinst.Some2 (f :: k2 -> k1 -> Type)) =
-      G.Rep ((Demote k2, Demote k1), Eithers2 f)
-    {-# INLINABLE from #-}
-    from = \s2x -> withSome2Sing s2x $ \sa2 sa1 (x :: f a2 a1) ->
-      case dict2 sa2 sa1 :: Dict (G.Generic (f a2 a1)) of
-        Dict -> case dict2 sa2 sa1 :: Dict (Inj (Eithers2 f) (f a2 a1)) of
-          Dict -> G.from ((fromSing sa2, fromSing sa1), inj x)
-    {-# INLINABLE to #-}
-    to = \(G.M1 (G.M1 (G.M1 (G.K1 (da2, da1)) G.:*: G.M1 (G.K1 ex)))) ->
-      withSomeSing da2 $ \(sa2 :: Sing (a2 :: k2)) ->
-        withSomeSing da1 $ \(sa1 :: Sing (a1 :: k1)) ->
-          case dict2 sa2 sa1 :: Dict (Inj (Eithers2 f) (f a2 a1)) of
-            Dict -> case prj ex of
-              Just x -> Exinst.Some2 sa2 sa1 (x :: f a2 a1)
-              Nothing -> error "Generic Some2: Malformed Rep"
-
-
----
-type Eithers3 (f :: k3 -> k2 -> k1 -> Type) =
-  Eithers3' (Cartesian3 (EnumFromTo (MinBound :: k3) (MaxBound :: k3))
-                        (EnumFromTo (MinBound :: k2) (MaxBound :: k2))
-                        (EnumFromTo (MinBound :: k1) (MaxBound :: k1))) f
-
--- | TODO: Mak1e this logarithmic.
-type family Eithers3' (xs :: [(k3, (k2, k1))]) (f :: k3 -> k2 -> k1 -> Type) :: Type where
-  Eithers3' ( '(x3, '(x2, x1)) ': '[]) f = f x3 x2 x1
-  Eithers3' ( '(x3, '(x2, x1)) ': xs)  f = Either (f x3 x2 x1) (Eithers3' xs f)
-
--- | We use nested 2-tuples instead of 3-tuples because it's easier to implement.
-type family Cartesian3 (xs3 :: [k3]) (xs2 :: [k2]) (xs1 :: [k1]) :: [(k3,(k2,k1))] where
-  Cartesian3 '[] xs2 xs1 = '[]
-  Cartesian3 (x3 ': xs3) xs2 xs1 =
-    List.Concat [ List.Map (Tuple2Sym1 x3) (Cartesian2 xs2 xs1)
-                , Cartesian3 xs3 xs2 xs1 ]
-
-
-instance forall k3 k2 k1 (f :: k3 -> k2 -> k1 -> Type)
-  . ( SingKind k3
-    , SingKind k2
-    , SingKind k1
-    , PEnum (Demote k3)
-    , PEnum (Demote k2)
-    , PEnum (Demote k1)
-    , PBounded (Demote k3)
-    , PBounded (Demote k2)
-    , PBounded (Demote k1)
-    , G.Generic (Demote k3)
-    , G.Generic (Demote k2)
-    , G.Generic (Demote k1)
-    , Dict3 G.Generic f
-    , Dict3 (Inj (Eithers3 f)) f
-    ) => G.Generic (Exinst.Some3 f)
-  where
-    type Rep (Exinst.Some3 (f :: k3 -> k2 -> k1 -> Type)) =
-      G.Rep ((Demote k3, Demote k2, Demote k1), Eithers3 f)
-    {-# INLINABLE from #-}
-    from = \s3x -> withSome3Sing s3x $ \sa3 sa2 sa1 (x :: f a3 a2 a1) ->
-      case dict3 sa3 sa2 sa1 :: Dict (G.Generic (f a3 a2 a1)) of
-        Dict -> case dict3 sa3 sa2 sa1 :: Dict (Inj (Eithers3 f) (f a3 a2 a1)) of
-          Dict -> G.from ((fromSing sa3, fromSing sa2, fromSing sa1), inj x)
-    {-# INLINABLE to #-}
-    to = \(G.M1 (G.M1 (G.M1 (G.K1 (da3, da2, da1)) G.:*: G.M1 (G.K1 ex)))) ->
-      withSomeSing da3 $ \(sa3 :: Sing (a3 :: k3)) ->
-        withSomeSing da2 $ \(sa2 :: Sing (a2 :: k2)) ->
-          withSomeSing da1 $ \(sa1 :: Sing (a1 :: k1)) ->
-            case dict3 sa3 sa2 sa1 :: Dict (Inj (Eithers3 f) (f a3 a2 a1)) of
-              Dict -> case prj ex of
-                Just x -> Exinst.Some3 sa3 sa2 sa1 (x :: f a3 a2 a1)
-                Nothing -> error "Generic Some3: Malformed Rep"
-
-
----
-type Eithers4 (f :: k4 -> k3 -> k2 -> k1 -> Type) =
-  Eithers4' (Cartesian4 (EnumFromTo (MinBound :: k4) (MaxBound :: k4))
-                        (EnumFromTo (MinBound :: k3) (MaxBound :: k3))
-                        (EnumFromTo (MinBound :: k2) (MaxBound :: k2))
-                        (EnumFromTo (MinBound :: k1) (MaxBound :: k1))) f
-
--- | TODO: Mak1e this logarithmic.
-type family Eithers4' (xs :: [(k4, (k3, (k2, k1)))]) (f :: k4 -> k3 -> k2 -> k1 -> Type) :: Type where
-  Eithers4' ( '( x4, '(x3, '(x2, x1))) ': '[]) f = f x4 x3 x2 x1
-  Eithers4' ( '( x4, '(x3, '(x2, x1))) ': xs)  f = Either (f x4 x3 x2 x1) (Eithers4' xs f)
-
--- | We use nested 2-tuples instead of 4-tuples because it's easier to implement.
-type family Cartesian4 (xs4 :: [k4]) (xs3 :: [k3]) (xs2 :: [k2]) (xs1 :: [k1]) :: [(k4,(k3,(k2,k1)))] where
-  Cartesian4 '[] xs3 xs2 xs1 = '[]
-  Cartesian4 (x4 ': xs4) xs3 xs2 xs1 =
-    List.Concat [ List.Map (Tuple2Sym1 x4) (Cartesian3 xs3 xs2 xs1)
-                , Cartesian4 xs4 xs3 xs2 xs1 ]
-
-
-instance forall k4 k3 k2 k1 (f :: k4 -> k3 -> k2 -> k1 -> Type)
-  . ( SingKind k4
-    , SingKind k3
-    , SingKind k2
-    , SingKind k1
-    , PEnum (Demote k4)
-    , PEnum (Demote k3)
-    , PEnum (Demote k2)
-    , PEnum (Demote k1)
-    , PBounded (Demote k4)
-    , PBounded (Demote k3)
-    , PBounded (Demote k2)
-    , PBounded (Demote k1)
-    , G.Generic (Demote k4)
-    , G.Generic (Demote k3)
-    , G.Generic (Demote k2)
-    , G.Generic (Demote k1)
-    , Dict4 G.Generic f
-    , Dict4 (Inj (Eithers4 f)) f
-    ) => G.Generic (Exinst.Some4 f)
-  where
-    type Rep (Exinst.Some4 (f :: k4 -> k3 -> k2 -> k1 -> Type)) =
-      G.Rep ((Demote k4, Demote k3, Demote k2, Demote k1), Eithers4 f)
-    {-# INLINABLE from #-}
-    from = \s4x -> withSome4Sing s4x $ \sa4 sa3 sa2 sa1 (x :: f a4 a3 a2 a1) ->
-      case dict4 sa4 sa3 sa2 sa1 :: Dict (G.Generic (f a4 a3 a2 a1)) of
-        Dict -> case dict4 sa4 sa3 sa2 sa1 :: Dict (Inj (Eithers4 f) (f a4 a3 a2 a1)) of
-          Dict -> G.from ((fromSing sa4, fromSing sa3, fromSing sa2, fromSing sa1), inj x)
-    {-# INLINABLE to #-}
-    to = \(G.M1 (G.M1 (G.M1 (G.K1 (da4, da3, da2, da1)) G.:*: G.M1 (G.K1 ex)))) ->
-      withSomeSing da4 $ \(sa4 :: Sing (a4 :: k4)) ->
-        withSomeSing da3 $ \(sa3 :: Sing (a3 :: k3)) ->
-          withSomeSing da2 $ \(sa2 :: Sing (a2 :: k2)) ->
-            withSomeSing da1 $ \(sa1 :: Sing (a1 :: k1)) ->
-              case dict4 sa4 sa3 sa2 sa1 :: Dict (Inj (Eithers4 f) (f a4 a3 a2 a1)) of
-                Dict -> case prj ex of
-                  Just x -> Exinst.Some4 sa4 sa3 sa2 sa1 (x :: f a4 a3 a2 a1)
-                  Nothing -> error "Generic Some4: Malformed Rep"
-
---------------------------------------------------------------------------------
---------------------------------------------------------------------------------
--- Out of the box 'DictX' instances for some @base@ types
-
-instance forall c.
-  (c 'False, c 'True
-  ) => Dict0 (c :: Bool -> Constraint) where
-  {-# INLINABLE dict0 #-}
-  dict0 = \case { SFalse -> Dict; STrue -> Dict }
-
-instance forall k0 c f.
-  ( c (f 'False), c (f 'True)
-  ) => Dict1 c (f :: Bool -> k0) where
-  {-# INLINABLE dict1 #-}
-  dict1 = \case { SFalse -> Dict; STrue -> Dict }
-
-instance forall k1 k0 c f.
-  ( Dict1 c (f 'False), Dict1 c (f 'True)
-  ) => Dict2 c (f :: Bool -> k1 -> k0) where
-  {-# INLINABLE dict2 #-}
-  dict2 = \x -> case x of { SFalse -> dict1; STrue -> dict1 }
-
-instance forall k2 k1 k0 c f.
-  ( Dict2 c (f 'False), Dict2 c (f 'True)
-  ) => Dict3 c (f :: Bool -> k2 -> k1 -> k0) where
-  {-# INLINABLE dict3 #-}
-  dict3 = \x -> case x of { SFalse -> dict2; STrue -> dict2 }
-
-instance forall k3 k2 k1 k0 c f.
-  ( Dict3 c (f 'False), Dict3 c (f 'True)
-  ) => Dict4 c (f :: Bool -> k3 -> k2 -> k1 -> k0) where
-  {-# INLINABLE dict4 #-}
-  dict4 = \x -> case x of { SFalse -> dict3; STrue -> dict3 }
-
---------------------------------------------------------------------------------
---------------------------------------------------------------------------------
--- Misc
-
-class Inj b a where
-  inj :: a -> b
-  prj :: b -> Maybe a
-instance Inj a a where
-  {-# INLINE inj #-}
-  inj = id
-  {-# INLINE prj #-}
-  prj = Just
-instance Inj (Either a b) a where
-  {-# INLINE inj #-}
-  inj = Left
-  {-# INLINE prj #-}
-  prj = either Just (const Nothing)
--- | TODO: Make this logarithmic.
-instance {-# OVERLAPPABLE #-} Inj x a => Inj (Either b x) a where
-  {-# INLINE inj #-}
-  inj = Right . inj
-  {-# INLINE prj #-}
-  prj = either (const Nothing) prj
-
diff --git a/lib/Exinst/Binary.hs b/lib/Exinst/Binary.hs
--- a/lib/Exinst/Binary.hs
+++ b/lib/Exinst/Binary.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE DataKinds #-}
+{-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE PolyKinds #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeInType #-}
diff --git a/lib/Exinst/DeepSeq.hs b/lib/Exinst/DeepSeq.hs
--- a/lib/Exinst/DeepSeq.hs
+++ b/lib/Exinst/DeepSeq.hs
@@ -1,5 +1,6 @@
 {-# LANGUAGE BangPatterns #-}
 {-# LANGUAGE DataKinds #-}
+{-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE PolyKinds #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE UndecidableInstances #-}
@@ -16,6 +17,7 @@
 
 import Control.DeepSeq (NFData(rnf))
 import Data.Constraint
+import Data.Kind (Type)
 import Prelude
 
 import Exinst.Internal
@@ -24,7 +26,7 @@
 
 --------------------------------------------------------------------------------
 
-instance forall k1 (f :: k1 -> *).
+instance forall k1 (f :: k1 -> Type).
   ( Dict1 NFData f
   ) => NFData (Some1 f) where
   {-# INLINABLE rnf #-}
@@ -33,7 +35,7 @@
        case dict1 sa1 :: Dict (NFData (f a1)) of
           Dict -> rnf x `seq` ()
 
-instance forall k2 k1 (f :: k2 -> k1 -> *).
+instance forall k2 k1 (f :: k2 -> k1 -> Type).
   ( Dict2 NFData f
   ) => NFData (Some2 f) where
   {-# INLINABLE rnf #-}
@@ -42,7 +44,7 @@
        case dict2 sa2 sa1 :: Dict (NFData (f a2 a1)) of
           Dict -> rnf x `seq` ()
 
-instance forall k3 k2 k1 (f :: k3 -> k2 -> k1 -> *).
+instance forall k3 k2 k1 (f :: k3 -> k2 -> k1 -> Type).
   ( Dict3 NFData f
   ) => NFData (Some3 f) where
   {-# INLINABLE rnf #-}
@@ -51,7 +53,7 @@
        case dict3 sa3 sa2 sa1 :: Dict (NFData (f a3 a2 a1)) of
           Dict -> rnf x `seq` ()
 
-instance forall k4 k3 k2 k1 (f :: k4 -> k3 -> k2 -> k1 -> *).
+instance forall k4 k3 k2 k1 (f :: k4 -> k3 -> k2 -> k1 -> Type).
   ( Dict4 NFData f
   ) => NFData (Some4 f) where
   {-# INLINABLE rnf #-}
diff --git a/lib/Exinst/Hashable.hs b/lib/Exinst/Hashable.hs
--- a/lib/Exinst/Hashable.hs
+++ b/lib/Exinst/Hashable.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE DataKinds #-}
+{-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE PolyKinds #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeInType #-}
@@ -36,6 +37,7 @@
   . ( SingKind k1
     , Hashable (Demote k1)
     , Dict1 Hashable f
+    , Eq (Some1 f)
     ) => Hashable (Some1 f)
   where
     {-# INLINABLE hashWithSalt #-}
@@ -51,6 +53,7 @@
     , Hashable (Demote k2)
     , Hashable (Demote k1)
     , Dict2 Hashable f
+    , Eq (Some2 f)
     ) => Hashable (Some2 f)
   where
     {-# INLINABLE hashWithSalt #-}
@@ -69,6 +72,7 @@
     , Hashable (Demote k2)
     , Hashable (Demote k1)
     , Dict3 Hashable f
+    , Eq (Some3 f)
     ) => Hashable (Some3 f)
   where
     {-# INLINABLE hashWithSalt #-}
@@ -89,6 +93,7 @@
     , Hashable (Demote k3)
     , Hashable (Demote k2)
     , Hashable (Demote k1)
+    , Eq (Some4 f)
     , Dict4 Hashable f
     ) => Hashable (Some4 f)
   where
diff --git a/tests/Main.hs b/tests/Main.hs
deleted file mode 100644
--- a/tests/Main.hs
+++ /dev/null
@@ -1,267 +0,0 @@
-{-# LANGUAGE CPP #-}
-{-# LANGUAGE ConstraintKinds #-}
-{-# LANGUAGE DataKinds #-}
-{-# LANGUAGE DeriveAnyClass #-}
-{-# LANGUAGE DeriveGeneric #-}
-{-# LANGUAGE FlexibleInstances #-}
-{-# LANGUAGE RankNTypes #-}
-{-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE TypeFamilies #-}
-
-module Main where
-
-import Control.DeepSeq (NFData(rnf))
-import qualified Data.Binary as Bin
-import qualified Data.ByteString.Lazy as BSL
-import Data.Hashable (Hashable(hash))
-import Data.Int (Int32)
-import Data.Kind (Type)
-import qualified GHC.Generics as G
-import qualified Test.Tasty as Tasty
-import qualified Test.Tasty.Runners as Tasty
-import Test.Tasty.QuickCheck ((===))
-import qualified Test.Tasty.QuickCheck as QC
-import Text.Read (readMaybe)
-
-import Exinst
-
---------------------------------------------------------------------------------
-
-main :: IO ()
-main = Tasty.defaultMainWithIngredients
-  [ Tasty.consoleTestReporter
-  , Tasty.listingTests
-  ] tt
-
---------------------------------------------------------------------------------
-
-data family X1 :: Bool -> Type
-data instance X1 'False = XF1 | XF2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X1 'True = XT1 | XT2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-
-data family X2 :: Bool -> Bool -> Type
-data instance X2 'False 'False = XFF1 | XFF2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X2 'False 'True = XFT1 | XFT2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X2 'True 'False = XTF1 | XTF2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X2 'True 'True = XTT1 | XTT2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-
-data family X3 :: Bool -> Bool -> Bool -> Type
-data instance X3 'False 'False 'False = XFFF1 | XFFF2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X3 'False 'False 'True = XFFT1 | XFFT2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X3 'False 'True 'False = XFTF1 | XFTF2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X3 'False 'True 'True = XFTT1 | XFTT2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X3 'True 'False 'False = XTFF1 | XTFF2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X3 'True 'False 'True = XTFT1 | XTFT2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X3 'True 'True 'False = XTTF1 | XTTF2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X3 'True 'True 'True = XTTT1 | XTTT2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-
-data family X4 :: Bool -> Bool -> Bool -> Bool -> Type
-data instance X4 'False 'False 'False 'False = XFFFF1 | XFFFF2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X4 'False 'False 'False 'True = XFFFT1 | XFFFT2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X4 'False 'False 'True 'False = XFFTF1 | XFFTF2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X4 'False 'False 'True 'True = XFFTT1 | XFFTT2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X4 'False 'True 'False 'False = XFTFF1 | XFTFF2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X4 'False 'True 'False 'True = XFTFT1 | XFTFT2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X4 'False 'True 'True 'False = XFTTF1 | XFTTF2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X4 'False 'True 'True 'True = XFTTT1 | XFTTT2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X4 'True 'False 'False 'False = XTFFF1 | XTFFF2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X4 'True 'False 'False 'True = XTFFT1 | XTFFT2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X4 'True 'False 'True 'False = XTFTF1 | XTFTF2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X4 'True 'False 'True 'True = XTFTT1 | XTFTT2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X4 'True 'True 'False 'False = XTTFF1 | XTTFF2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X4 'True 'True 'False 'True = XTTFT1 | XTTFT2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X4 'True 'True 'True 'False = XTTTF1 | XTTTF2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-data instance X4 'True 'True 'True 'True = XTTTT1 | XTTTT2 Int32 deriving (Eq, Show, Read, G.Generic, Bin.Binary, NFData)
-
-#define INSTANCETRON(c) \
-  instance c (X1 'False); \
-  instance c (X1 'True); \
-  instance c (X2 'False 'False); \
-  instance c (X2 'False 'True); \
-  instance c (X2 'True 'False); \
-  instance c (X2 'True 'True); \
-  instance c (X3 'False 'False 'False); \
-  instance c (X3 'False 'False 'True); \
-  instance c (X3 'False 'True 'False); \
-  instance c (X3 'False 'True 'True); \
-  instance c (X3 'True 'False 'False); \
-  instance c (X3 'True 'False 'True); \
-  instance c (X3 'True 'True 'False); \
-  instance c (X3 'True 'True 'True); \
-  instance c (X4 'False 'False 'False 'False); \
-  instance c (X4 'False 'False 'False 'True); \
-  instance c (X4 'False 'False 'True 'False); \
-  instance c (X4 'False 'False 'True 'True); \
-  instance c (X4 'False 'True 'False 'False); \
-  instance c (X4 'False 'True 'False 'True); \
-  instance c (X4 'False 'True 'True 'False); \
-  instance c (X4 'False 'True 'True 'True); \
-  instance c (X4 'True 'False 'False 'False); \
-  instance c (X4 'True 'False 'False 'True); \
-  instance c (X4 'True 'False 'True 'False); \
-  instance c (X4 'True 'False 'True 'True); \
-  instance c (X4 'True 'True 'False 'False); \
-  instance c (X4 'True 'True 'False 'True); \
-  instance c (X4 'True 'True 'True 'False); \
-  instance c (X4 'True 'True 'True 'True)
-
---------------------------------------------------------------------------------
--- Arbitrary instances
-
-instance QC.Arbitrary (X1 'False) where arbitrary = QC.oneof [ pure XF1, fmap XF2 QC.arbitrary ]
-instance QC.Arbitrary (X1 'True) where arbitrary = QC.oneof [ pure XT1, fmap XT2 QC.arbitrary ]
-
-instance QC.Arbitrary (X2 'False 'False) where arbitrary = QC.oneof [ pure XFF1, fmap XFF2 QC.arbitrary ]
-instance QC.Arbitrary (X2 'False 'True) where arbitrary = QC.oneof [ pure XFT1, fmap XFT2 QC.arbitrary ]
-instance QC.Arbitrary (X2 'True 'False) where arbitrary = QC.oneof [ pure XTF1, fmap XTF2 QC.arbitrary ]
-instance QC.Arbitrary (X2 'True 'True) where arbitrary = QC.oneof [ pure XTT1, fmap XTT2 QC.arbitrary ]
-
-instance QC.Arbitrary (X3 'False 'False 'False) where arbitrary = QC.oneof [ pure XFFF1, fmap XFFF2 QC.arbitrary ]
-instance QC.Arbitrary (X3 'False 'False 'True) where arbitrary = QC.oneof [ pure XFFT1, fmap XFFT2 QC.arbitrary ]
-instance QC.Arbitrary (X3 'False 'True 'False) where arbitrary = QC.oneof [ pure XFTF1, fmap XFTF2 QC.arbitrary ]
-instance QC.Arbitrary (X3 'False 'True 'True) where arbitrary = QC.oneof [ pure XFTT1, fmap XFTT2 QC.arbitrary ]
-instance QC.Arbitrary (X3 'True 'False 'False) where arbitrary = QC.oneof [ pure XTFF1, fmap XTFF2 QC.arbitrary ]
-instance QC.Arbitrary (X3 'True 'False 'True) where arbitrary = QC.oneof [ pure XTFT1, fmap XTFT2 QC.arbitrary ]
-instance QC.Arbitrary (X3 'True 'True 'False) where arbitrary = QC.oneof [ pure XTTF1, fmap XTTF2 QC.arbitrary ]
-instance QC.Arbitrary (X3 'True 'True 'True) where arbitrary = QC.oneof [ pure XTTT1, fmap XTTT2 QC.arbitrary ]
-
-instance QC.Arbitrary (X4 'False 'False 'False 'False) where arbitrary = QC.oneof [ pure XFFFF1, fmap XFFFF2 QC.arbitrary ]
-instance QC.Arbitrary (X4 'False 'False 'False 'True) where arbitrary = QC.oneof [ pure XFFFT1, fmap XFFFT2 QC.arbitrary ]
-instance QC.Arbitrary (X4 'False 'False 'True 'False) where arbitrary = QC.oneof [ pure XFFTF1, fmap XFFTF2 QC.arbitrary ]
-instance QC.Arbitrary (X4 'False 'False 'True 'True) where arbitrary = QC.oneof [ pure XFFTT1, fmap XFFTT2 QC.arbitrary ]
-instance QC.Arbitrary (X4 'False 'True 'False 'False) where arbitrary = QC.oneof [ pure XFTFF1, fmap XFTFF2 QC.arbitrary ]
-instance QC.Arbitrary (X4 'False 'True 'False 'True) where arbitrary = QC.oneof [ pure XFTFT1, fmap XFTFT2 QC.arbitrary ]
-instance QC.Arbitrary (X4 'False 'True 'True 'False) where arbitrary = QC.oneof [ pure XFTTF1, fmap XFTTF2 QC.arbitrary ]
-instance QC.Arbitrary (X4 'False 'True 'True 'True) where arbitrary = QC.oneof [ pure XFTTT1, fmap XFTTT2 QC.arbitrary ]
-instance QC.Arbitrary (X4 'True 'False 'False 'False) where arbitrary = QC.oneof [ pure XTFFF1, fmap XTFFF2 QC.arbitrary ]
-instance QC.Arbitrary (X4 'True 'False 'False 'True) where arbitrary = QC.oneof [ pure XTFFT1, fmap XTFFT2 QC.arbitrary ]
-instance QC.Arbitrary (X4 'True 'False 'True 'False) where arbitrary = QC.oneof [ pure XTFTF1, fmap XTFTF2 QC.arbitrary ]
-instance QC.Arbitrary (X4 'True 'False 'True 'True) where arbitrary = QC.oneof [ pure XTFTT1, fmap XTFTT2 QC.arbitrary ]
-instance QC.Arbitrary (X4 'True 'True 'False 'False) where arbitrary = QC.oneof [ pure XTTFF1, fmap XTTFF2 QC.arbitrary ]
-instance QC.Arbitrary (X4 'True 'True 'False 'True) where arbitrary = QC.oneof [ pure XTTFT1, fmap XTTFT2 QC.arbitrary ]
-instance QC.Arbitrary (X4 'True 'True 'True 'False) where arbitrary = QC.oneof [ pure XTTTF1, fmap XTTTF2 QC.arbitrary ]
-instance QC.Arbitrary (X4 'True 'True 'True 'True) where arbitrary = QC.oneof [ pure XTTTT1, fmap XTTTT2 QC.arbitrary ]
-
---------------------------------------------------------------------------------
-
-tt :: Tasty.TestTree
-tt =
-  Tasty.testGroup "main"
-  [ tt_nfdata
-  , tt_id "Identity through Show/Read" id_show_read
-  , tt_id "Identity through GHC's Generic" id_generic
-  , tt_id "Identity through Binary's Binary" id_binary
-  ]
-
-type MegaCtx a =
-  ( G.Generic a
-  , Show a
-  , Read a
-  , Hashable a
-  , Bin.Binary a
-  )
-
-tt_id
-  :: String
-  -> (forall a. MegaCtx a => a -> Maybe a)
-  -- ^ It's easier to put all the constraints here in the 'MegaCtx' monster.
-  -> Tasty.TestTree
-tt_id = \title id' -> Tasty.testGroup title
-  [ QC.testProperty "Some1 X1" $
-      QC.forAll QC.arbitrary $ \(x :: Some1 X1) -> Just x === id' x
-  , QC.testProperty "Some2 X2" $
-      QC.forAll QC.arbitrary $ \(x :: Some2 X2) -> Just x === id' x
-  , QC.testProperty "Some3 X3" $
-      QC.forAll QC.arbitrary $ \(x :: Some3 X3) -> Just x === id' x
-  , QC.testProperty "Some4 X4" $
-      QC.forAll QC.arbitrary $ \(x :: Some4 X4) -> Just x === id' x
-  , QC.testProperty "Some1 (P1 X1 X1)" $
-      QC.forAll QC.arbitrary $ \(x :: Some1 (P1 X1 X1)) -> Just x === id' x
-  , QC.testProperty "Some2 (P2 X2 X2)" $
-      QC.forAll QC.arbitrary $ \(x :: Some2 (P2 X2 X2)) -> Just x === id' x
-  , QC.testProperty "Some3 (P3 X3 X3)" $
-      QC.forAll QC.arbitrary $ \(x :: Some3 (P3 X3 X3)) -> Just x === id' x
-  , QC.testProperty "Some4 (P4 X4 X4)" $
-      QC.forAll QC.arbitrary $ \(x :: Some4 (P4 X4 X4)) -> Just x === id' x
-  , QC.testProperty "Some1 (S1 X1 X1)" $
-      QC.forAll QC.arbitrary $ \(x :: Some1 (S1 X1 X1)) -> Just x === id' x
-  , QC.testProperty "Some2 (S2 X2 X2)" $
-      QC.forAll QC.arbitrary $ \(x :: Some2 (S2 X2 X2)) -> Just x === id' x
-  , QC.testProperty "Some3 (S3 X3 X3)" $
-      QC.forAll QC.arbitrary $ \(x :: Some3 (S3 X3 X3)) -> Just x === id' x
-  , QC.testProperty "Some4 (S4 X4 X4)" $
-      QC.forAll QC.arbitrary $ \(x :: Some4 (S4 X4 X4)) -> Just x === id' x
-  ]
-
-tt_nfdata :: Tasty.TestTree
-tt_nfdata = Tasty.testGroup "NFData"
-  [ QC.testProperty "Some1 X1" $
-      QC.forAll QC.arbitrary $ \(x :: Some1 X1) -> () === rnf x
-  , QC.testProperty "Some2 X2" $
-      QC.forAll QC.arbitrary $ \(x :: Some2 X2) -> () === rnf x
-  , QC.testProperty "Some3 X3" $
-      QC.forAll QC.arbitrary $ \(x :: Some3 X3) -> () === rnf x
-  , QC.testProperty "Some4 X4" $
-      QC.forAll QC.arbitrary $ \(x :: Some4 X4) -> () === rnf x
-  , QC.testProperty "Some1 (P1 X1 X1)" $
-      QC.forAll QC.arbitrary $ \(x :: Some1 (P1 X1 X1)) -> () === rnf x
-  , QC.testProperty "Some2 (P2 X2 X2)" $
-      QC.forAll QC.arbitrary $ \(x :: Some2 (P2 X2 X2)) -> () === rnf x
-  , QC.testProperty "Some3 (P3 X3 X3)" $
-      QC.forAll QC.arbitrary $ \(x :: Some3 (P3 X3 X3)) -> () === rnf x
-  , QC.testProperty "Some4 (P4 X4 X4)" $
-      QC.forAll QC.arbitrary $ \(x :: Some4 (P4 X4 X4)) -> () === rnf x
-  , QC.testProperty "Some1 (S1 X1 X1)" $
-      QC.forAll QC.arbitrary $ \(x :: Some1 (S1 X1 X1)) -> () === rnf x
-  , QC.testProperty "Some2 (S2 X2 X2)" $
-      QC.forAll QC.arbitrary $ \(x :: Some2 (S2 X2 X2)) -> () === rnf x
-  , QC.testProperty "Some3 (S3 X3 X3)" $
-      QC.forAll QC.arbitrary $ \(x :: Some3 (S3 X3 X3)) -> () === rnf x
-  , QC.testProperty "Some4 (S4 X4 X4)" $
-      QC.forAll QC.arbitrary $ \(x :: Some4 (S4 X4 X4)) -> () === rnf x
-  ]
-
-INSTANCETRON(Hashable)
-
-tt_hashable :: Tasty.TestTree
-tt_hashable = Tasty.testGroup "Hashable"
-  [ QC.testProperty "Some1 X1" $
-      QC.forAll QC.arbitrary $ \(x :: Some1 X1) -> () === (hash x `seq` ())
-  , QC.testProperty "Some2 X2" $
-      QC.forAll QC.arbitrary $ \(x :: Some2 X2) -> () === (hash x `seq` ())
-  , QC.testProperty "Some3 X3" $
-      QC.forAll QC.arbitrary $ \(x :: Some3 X3) -> () === (hash x `seq` ())
-  , QC.testProperty "Some4 X4" $
-      QC.forAll QC.arbitrary $ \(x :: Some4 X4) -> () === (hash x `seq` ())
-  , QC.testProperty "Some1 (P1 X1 X1)" $
-      QC.forAll QC.arbitrary $ \(x :: Some1 (P1 X1 X1)) -> () === (hash x `seq` ())
-  , QC.testProperty "Some2 (P2 X2 X2)" $
-      QC.forAll QC.arbitrary $ \(x :: Some2 (P2 X2 X2)) -> () === (hash x `seq` ())
-  , QC.testProperty "Some3 (P3 X3 X3)" $
-      QC.forAll QC.arbitrary $ \(x :: Some3 (P3 X3 X3)) -> () === (hash x `seq` ())
-  , QC.testProperty "Some4 (P4 X4 X4)" $
-      QC.forAll QC.arbitrary $ \(x :: Some4 (P4 X4 X4)) -> () === (hash x `seq` ())
-  , QC.testProperty "Some1 (S1 X1 X1)" $
-      QC.forAll QC.arbitrary $ \(x :: Some1 (S1 X1 X1)) -> () === (hash x `seq` ())
-  , QC.testProperty "Some2 (S2 X2 X2)" $
-      QC.forAll QC.arbitrary $ \(x :: Some2 (S2 X2 X2)) -> () === (hash x `seq` ())
-  , QC.testProperty "Some3 (S3 X3 X3)" $
-      QC.forAll QC.arbitrary $ \(x :: Some3 (S3 X3 X3)) -> () === (hash x `seq` ())
-  , QC.testProperty "Some4 (S4 X4 X4)" $
-      QC.forAll QC.arbitrary $ \(x :: Some4 (S4 X4 X4)) -> () === (hash x `seq` ())
-  ]
-
---------------------------------------------------------------------------------
-
-id_show_read :: (Show a, Read a) => a -> Maybe a
-id_show_read = readMaybe . show
-
-id_generic :: G.Generic a => a -> Maybe a
-id_generic = Just . G.to . G.from
-
-id_binary :: Bin.Binary a => a -> Maybe a
-id_binary = \a ->
-  case Bin.decodeOrFail (Bin.encode a) of
-      Right (z,_,a') | BSL.null z -> Just a'
-      _ -> Nothing
-
