diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,23 @@
 The format is based on [Keep a Changelog 1.1](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to the [Haskell Package Versioning Policy](https://pvp.haskell.org/).
 
+## [1.0.0.0] - 2026-04-22
+
+### Added
+
+- support for yaya-1.0.0.0
+
+### Changed
+
+- generalized type of `zygoHistoPrepro`
+
+### Removed
+
+- dependency on `lens`
+- `corecursivePrism` (this was _not_ added to `yaya-lens`)
+- `seqFreeT` and `futu` (these are now in `yaya`, because they’re safe)
+- any import of `Yaya.Unsafe.Fold.Instances`, fixing massive transitive leakage of unsafe instances
+
 ## [0.5.0.0] - 2026-01-18
 
 ### Added
@@ -111,12 +128,13 @@
 
 - everything (this is the initial release)
 
-[0.5.0.0]: https://github.com/sellout/no-recursion/compare/v3.2.3...v4.0.0
-[0.4.1.4]: https://github.com/sellout/no-recursion/compare/v3.2.2...v3.2.3
-[0.4.1.3]: https://github.com/sellout/no-recursion/compare/v3.2.1...v3.2.2
-[0.4.1.2]: https://github.com/sellout/no-recursion/compare/v3.2.0...v3.2.1
-[0.4.1.1]: https://github.com/sellout/no-recursion/compare/v3.1.0...v3.2.0
-[0.4.1.0]: https://github.com/sellout/no-recursion/compare/v3.0.0...v3.1.0
-[0.4.0.0]: https://github.com/sellout/no-recursion/compare/v2.0.0...v3.0.0
-[0.3.3.1]: https://github.com/sellout/no-recursion/compare/v1.0.0...v2.0.0
+[1.0.0.0]: https://github.com/sellout/yaya/compare/v4.0.0...v5.0.0
+[0.5.0.0]: https://github.com/sellout/yaya/compare/v3.2.3...v4.0.0
+[0.4.1.4]: https://github.com/sellout/yaya/compare/v3.2.2...v3.2.3
+[0.4.1.3]: https://github.com/sellout/yaya/compare/v3.2.1...v3.2.2
+[0.4.1.2]: https://github.com/sellout/yaya/compare/v3.2.0...v3.2.1
+[0.4.1.1]: https://github.com/sellout/yaya/compare/v3.1.0...v3.2.0
+[0.4.1.0]: https://github.com/sellout/yaya/compare/v3.0.0...v3.1.0
+[0.4.0.0]: https://github.com/sellout/yaya/compare/v2.0.0...v3.0.0
+[0.3.3.1]: https://github.com/sellout/yaya/compare/v1.0.0...v2.0.0
 [0.3.3.0]: https://github.com/sellout/yaya/releases/tag/v1.0.0
diff --git a/Setup.hs b/Setup.hs
--- a/Setup.hs
+++ b/Setup.hs
@@ -1,17 +1,12 @@
 -- __NB__: `custom-setup` doesn’t have any way to specify extensions or options,
 --         so any we want need to be specified here.
-{-# LANGUAGE CPP #-}
 {-# LANGUAGE PackageImports #-}
 {-# LANGUAGE Unsafe #-}
 {-# LANGUAGE NoImplicitPrelude #-}
-#if MIN_VERSION_GLASGOW_HASKELL(8, 0, 0, 0)
 {-# OPTIONS_GHC -Weverything #-}
 -- Warns even when `Unsafe` is explicit, not inferred. See
 -- https://gitlab.haskell.org/ghc/ghc/-/issues/16689
 {-# OPTIONS_GHC -Wno-unsafe #-}
-#else
-{-# OPTIONS_GHC -Wall #-}
-#endif
 
 module Main (main) where
 
diff --git a/docs/license-report.md b/docs/license-report.md
--- a/docs/license-report.md
+++ b/docs/license-report.md
@@ -9,34 +9,31 @@
 | Name | Version | [SPDX](https://spdx.org/licenses/) License Id | Description | Also depended upon by |
 | --- | --- | --- | --- | --- |
 | **`base`** | [`4.20.0.0`](http://hackage.haskell.org/package/base-4.20.0.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/base-4.20.0.0/src/LICENSE) | Core data structures and operations | *(core library)* |
-| `comonad` | [`5.0.10`](http://hackage.haskell.org/package/comonad-5.0.10) | [`BSD-3-Clause`](http://hackage.haskell.org/package/comonad-5.0.10/src/LICENSE) | Comonads | `adjunctions`, `bifunctors`, `free`, `invariant`, `kan-extensions`, `lens`, `profunctors`, `semigroupoids`, `yaya` |
-| `free` | [`5.2`](http://hackage.haskell.org/package/free-5.2) | [`BSD-3-Clause`](http://hackage.haskell.org/package/free-5.2/src/LICENSE) | Monads for free | `adjunctions`, `kan-extensions`, `lens`, `yaya` |
-| `lens` | [`5.3.6`](http://hackage.haskell.org/package/lens-5.3.6) | [`BSD-2-Clause`](http://hackage.haskell.org/package/lens-5.3.6/src/LICENSE) | Lenses, Folds and Traversals | `yaya` |
+| `comonad` | [`5.0.10`](http://hackage.haskell.org/package/comonad-5.0.10) | [`BSD-3-Clause`](http://hackage.haskell.org/package/comonad-5.0.10/src/LICENSE) | Comonads | `adjunctions`, `bifunctors`, `free`, `invariant`, `kan-extensions`, `profunctors`, `semigroupoids`, `yaya` |
+| `free` | [`5.2`](http://hackage.haskell.org/package/free-5.2) | [`BSD-3-Clause`](http://hackage.haskell.org/package/free-5.2/src/LICENSE) | Monads for free | `adjunctions`, `kan-extensions`, `yaya` |
 | `no-recursion` | [`0.4.0.0`](http://hackage.haskell.org/package/no-recursion-0.4.0.0) | [`(AGPL-3.0-only WITH Universal-FOSS-exception-1.0 OR LicenseRef-commercial)`](http://hackage.haskell.org/package/no-recursion-0.4.0.0/src/LICENSE) | A GHC plugin to remove support for recursion | `yaya` |
-| `yaya` | [`0.7.0.0`](http://hackage.haskell.org/package/yaya-0.7.0.0) |  *MISSING* | *MISSING* |  |
+| `yaya` | [`1.0.0.0`](http://hackage.haskell.org/package/yaya-1.0.0.0) |  *MISSING* | *MISSING* |  |
 
 ## Indirect transitive dependencies
 
 | Name | Version | [SPDX](https://spdx.org/licenses/) License Id | Description | Depended upon by |
 | --- | --- | --- | --- | --- |
-| `OneTuple` | [`0.4.2.1`](http://hackage.haskell.org/package/OneTuple-0.4.2.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/OneTuple-0.4.2.1/src/LICENSE) | Singleton Tuple | `indexed-traversable-instances` |
 | `StateVar` | [`1.2.2`](http://hackage.haskell.org/package/StateVar-1.2.2) | [`BSD-3-Clause`](http://hackage.haskell.org/package/StateVar-1.2.2/src/LICENSE) | State variables | `contravariant`, `invariant` |
 | `adjunctions` | [`4.4.4`](http://hackage.haskell.org/package/adjunctions-4.4.4) | [`BSD-2-Clause`](http://hackage.haskell.org/package/adjunctions-4.4.4/src/LICENSE) | Adjunctions and representable functors | `kan-extensions` |
-| **`array`** | [`0.5.7.0`](http://hackage.haskell.org/package/array-0.5.7.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/array-0.5.7.0/src/LICENSE) | Mutable and immutable arrays | `binary`, `containers`, `deepseq`, `ghc`, `ghci`, `indexed-traversable`, `invariant`, `lens`, `parallel`, `stm`, `text` |
-| `assoc` | [`1.1.1`](http://hackage.haskell.org/package/assoc-1.1.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/assoc-1.1.1/src/LICENSE) | swap and assoc: Symmetric and Semigroupy Bifunctors | `bifunctors`, `lens`, `strict`, `these` |
-| `base-orphans` | [`0.9.4`](http://hackage.haskell.org/package/base-orphans-0.9.4) | [`MIT`](http://hackage.haskell.org/package/base-orphans-0.9.4/src/LICENSE) | Backwards-compatible orphan instances for base | `lens`, `profunctors`, `semigroupoids`, `transformers-base` |
-| `bifunctors` | [`5.6.3`](http://hackage.haskell.org/package/bifunctors-5.6.3) | [`BSD-3-Clause`](http://hackage.haskell.org/package/bifunctors-5.6.3/src/LICENSE) | Bifunctors | `either`, `invariant`, `lens`, `profunctors`, `semigroupoids` |
+| **`array`** | [`0.5.7.0`](http://hackage.haskell.org/package/array-0.5.7.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/array-0.5.7.0/src/LICENSE) | Mutable and immutable arrays | `binary`, `containers`, `deepseq`, `ghc`, `ghci`, `indexed-traversable`, `invariant`, `stm`, `text` |
+| `assoc` | [`1.1.1`](http://hackage.haskell.org/package/assoc-1.1.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/assoc-1.1.1/src/LICENSE) | swap and assoc: Symmetric and Semigroupy Bifunctors | `bifunctors`, `strict`, `these` |
+| `base-orphans` | [`0.9.4`](http://hackage.haskell.org/package/base-orphans-0.9.4) | [`MIT`](http://hackage.haskell.org/package/base-orphans-0.9.4/src/LICENSE) | Backwards-compatible orphan instances for base | `profunctors`, `semigroupoids`, `transformers-base` |
+| `bifunctors` | [`5.6.3`](http://hackage.haskell.org/package/bifunctors-5.6.3) | [`BSD-3-Clause`](http://hackage.haskell.org/package/bifunctors-5.6.3/src/LICENSE) | Bifunctors | `either`, `invariant`, `profunctors`, `semigroupoids` |
 | **`binary`** | [`0.8.9.2`](http://hackage.haskell.org/package/binary-0.8.9.2) | [`BSD-3-Clause`](http://hackage.haskell.org/package/binary-0.8.9.2/src/LICENSE) | Binary serialisation for Haskell values using lazy ByteStrings | `ghc`, `ghc-boot`, `ghci`, `strict`, `text`, `these` |
-| **`bytestring`** | [`0.12.1.0`](http://hackage.haskell.org/package/bytestring-0.12.1.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/bytestring-0.12.1.0/src/LICENSE) | Fast, compact, strict and lazy byte strings with a list interface | `binary`, `filepath`, `ghc`, `ghc-boot`, `ghci`, `hashable`, `lens`, `os-string`, `strict`, `text`, `unix` |
-| `call-stack` | [`0.4.0`](http://hackage.haskell.org/package/call-stack-0.4.0) | [`MIT`](http://hackage.haskell.org/package/call-stack-0.4.0/src/LICENSE) | Use GHC call-stacks in a backward compatible way | `lens` |
-| **`containers`** | [`0.7`](http://hackage.haskell.org/package/containers-0.7) | [`BSD-3-Clause`](http://hackage.haskell.org/package/containers-0.7/src/LICENSE) | Assorted concrete container types | `adjunctions`, `bifunctors`, `binary`, `comonad`, `free`, `ghc`, `ghc-boot`, `ghc-heap`, `ghci`, `hashable`, `hpc`, `indexed-traversable`, `invariant`, `lens`, `parallel`, `semigroupoids`, `th-abstraction` |
-| `contravariant` | [`1.5.6`](http://hackage.haskell.org/package/contravariant-1.5.6) | [`BSD-3-Clause`](http://hackage.haskell.org/package/contravariant-1.5.6/src/LICENSE) | Contravariant functors | `invariant`, `kan-extensions`, `lens`, `profunctors`, `semigroupoids` |
-| **`deepseq`** | [`1.5.0.0`](http://hackage.haskell.org/package/deepseq-1.5.0.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/deepseq-1.5.0.0/src/LICENSE) | Deep evaluation of data structures | `bytestring`, `containers`, `filepath`, `ghc`, `ghc-boot`, `ghci`, `hashable`, `hpc`, `os-string`, `parallel`, `pretty`, `primitive`, `process`, `strict`, `tagged`, `text`, `these`, `time`, `unordered-containers`, `vector` |
+| **`bytestring`** | [`0.12.1.0`](http://hackage.haskell.org/package/bytestring-0.12.1.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/bytestring-0.12.1.0/src/LICENSE) | Fast, compact, strict and lazy byte strings with a list interface | `binary`, `filepath`, `ghc`, `ghc-boot`, `ghci`, `hashable`, `os-string`, `strict`, `text`, `unix` |
+| **`containers`** | [`0.7`](http://hackage.haskell.org/package/containers-0.7) | [`BSD-3-Clause`](http://hackage.haskell.org/package/containers-0.7/src/LICENSE) | Assorted concrete container types | `adjunctions`, `bifunctors`, `binary`, `comonad`, `free`, `ghc`, `ghc-boot`, `ghc-heap`, `ghci`, `hashable`, `hpc`, `indexed-traversable`, `invariant`, `semigroupoids`, `th-abstraction` |
+| `contravariant` | [`1.5.6`](http://hackage.haskell.org/package/contravariant-1.5.6) | [`BSD-3-Clause`](http://hackage.haskell.org/package/contravariant-1.5.6/src/LICENSE) | Contravariant functors | `invariant`, `kan-extensions`, `profunctors`, `semigroupoids` |
+| **`deepseq`** | [`1.5.0.0`](http://hackage.haskell.org/package/deepseq-1.5.0.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/deepseq-1.5.0.0/src/LICENSE) | Deep evaluation of data structures | `bytestring`, `containers`, `filepath`, `ghc`, `ghc-boot`, `ghci`, `hashable`, `hpc`, `os-string`, `pretty`, `process`, `strict`, `tagged`, `text`, `these`, `time`, `unordered-containers` |
 | **`directory`** | [`1.3.8.3`](http://hackage.haskell.org/package/directory-1.3.8.3) | [`BSD-3-Clause`](http://hackage.haskell.org/package/directory-1.3.8.3/src/LICENSE) | Platform-agnostic library for filesystem operations | `ghc`, `ghc-boot`, `hpc`, `process` |
-| `distributive` | [`0.6.3`](http://hackage.haskell.org/package/distributive-0.6.3) | [`BSD-3-Clause`](http://hackage.haskell.org/package/distributive-0.6.3/src/LICENSE) | Distributive functors -- Dual to Traversable | `adjunctions`, `comonad`, `free`, `kan-extensions`, `lens`, `profunctors` |
+| `distributive` | [`0.6.3`](http://hackage.haskell.org/package/distributive-0.6.3) | [`BSD-3-Clause`](http://hackage.haskell.org/package/distributive-0.6.3/src/LICENSE) | Distributive functors -- Dual to Traversable | `adjunctions`, `comonad`, `free`, `kan-extensions`, `profunctors` |
 | `either` | [`5.0.3`](http://hackage.haskell.org/package/either-5.0.3) | [`BSD-3-Clause`](http://hackage.haskell.org/package/either-5.0.3/src/LICENSE) | Combinators for working with sums | `yaya` |
-| **`exceptions`** | [`0.10.7`](http://hackage.haskell.org/package/exceptions-0.10.7) | [`BSD-3-Clause`](http://hackage.haskell.org/package/exceptions-0.10.7/src/LICENSE) | Extensible optionally-pure exceptions | `filepath`, `free`, `ghc`, `kan-extensions`, `lens`, `os-string`, `semaphore-compat` |
-| **`filepath`** | [`1.5.2.0`](http://hackage.haskell.org/package/filepath-1.5.2.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/filepath-1.5.2.0/src/LICENSE) | Library for manipulating FilePaths in a cross platform way. | `directory`, `ghc`, `ghc-boot`, `ghci`, `hashable`, `hpc`, `lens`, `process`, `unix` |
+| **`exceptions`** | [`0.10.7`](http://hackage.haskell.org/package/exceptions-0.10.7) | [`BSD-3-Clause`](http://hackage.haskell.org/package/exceptions-0.10.7/src/LICENSE) | Extensible optionally-pure exceptions | `filepath`, `free`, `ghc`, `kan-extensions`, `os-string`, `semaphore-compat` |
+| **`filepath`** | [`1.5.2.0`](http://hackage.haskell.org/package/filepath-1.5.2.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/filepath-1.5.2.0/src/LICENSE) | Library for manipulating FilePaths in a cross platform way. | `directory`, `ghc`, `ghc-boot`, `ghci`, `hashable`, `hpc`, `process`, `unix` |
 | **`ghc`** | [`9.10.1`](http://hackage.haskell.org/package/ghc-9.10.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/ghc-9.10.1/src/LICENSE) | The GHC API | `no-recursion` |
 | **`ghc-bignum`** | [`1.3`](http://hackage.haskell.org/package/ghc-bignum-1.3) | [`BSD-3-Clause`](http://hackage.haskell.org/package/ghc-bignum-1.3/src/LICENSE) | GHC BigNum library | `ghc-internal` |
 | **`ghc-boot`** | [`9.10.1`](http://hackage.haskell.org/package/ghc-boot-9.10.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/ghc-boot-9.10.1/src/LICENSE) | Shared functionality between GHC and its boot libraries | `ghc`, `ghci` |
@@ -46,35 +43,29 @@
 | **`ghc-platform`** | [`0.1.0.0`](http://hackage.haskell.org/package/ghc-platform-0.1.0.0) |  *MISSING* | *MISSING* | `ghc-boot` |
 | **`ghc-prim`** | [`0.11.0`](http://hackage.haskell.org/package/ghc-prim-0.11.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/ghc-prim-0.11.0/src/LICENSE) | GHC primitives | *(core library)* |
 | **`ghci`** | [`9.10.1`](http://hackage.haskell.org/package/ghci-9.10.1) |  *MISSING* | *MISSING* | `ghc` |
-| `hashable` | [`1.5.1.0`](http://hackage.haskell.org/package/hashable-1.5.1.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/hashable-1.5.1.0/src/LICENSE) | A class for types that can be converted to a hash value | `lens`, `semigroupoids`, `strict`, `these`, `unordered-containers` |
+| `hashable` | [`1.5.1.0`](http://hackage.haskell.org/package/hashable-1.5.1.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/hashable-1.5.1.0/src/LICENSE) | A class for types that can be converted to a hash value | `semigroupoids`, `strict`, `these`, `unordered-containers` |
 | **`hpc`** | [`0.7.0.1`](http://hackage.haskell.org/package/hpc-0.7.0.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/hpc-0.7.0.1/src/LICENSE) | Code Coverage Library for Haskell | `ghc` |
-| `indexed-traversable` | [`0.1.4`](http://hackage.haskell.org/package/indexed-traversable-0.1.4) | [`BSD-2-Clause`](http://hackage.haskell.org/package/indexed-traversable-0.1.4/src/LICENSE) | FunctorWithIndex, FoldableWithIndex, TraversableWithIndex | `comonad`, `free`, `indexed-traversable-instances`, `lens` |
-| `indexed-traversable-instances` | [`0.1.2`](http://hackage.haskell.org/package/indexed-traversable-instances-0.1.2) | [`BSD-2-Clause`](http://hackage.haskell.org/package/indexed-traversable-instances-0.1.2/src/LICENSE) | More instances of FunctorWithIndex, FoldableWithIndex, TraversableWithIndex | `lens` |
+| `indexed-traversable` | [`0.1.4`](http://hackage.haskell.org/package/indexed-traversable-0.1.4) | [`BSD-2-Clause`](http://hackage.haskell.org/package/indexed-traversable-0.1.4/src/LICENSE) | FunctorWithIndex, FoldableWithIndex, TraversableWithIndex | `comonad`, `free` |
 | `invariant` | [`0.6.5`](http://hackage.haskell.org/package/invariant-0.6.5) | [`BSD-2-Clause`](http://hackage.haskell.org/package/invariant-0.6.5/src/LICENSE) | Haskell98 invariant functors | `kan-extensions` |
-| `kan-extensions` | [`5.2.8`](http://hackage.haskell.org/package/kan-extensions-5.2.8) | [`BSD-3-Clause`](http://hackage.haskell.org/package/kan-extensions-5.2.8/src/LICENSE) | Kan extensions, Kan lifts, the Yoneda lemma, and (co)density (co)monads | `lens`, `yaya` |
-| **`mtl`** | [`2.3.1`](http://hackage.haskell.org/package/mtl-2.3.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/mtl-2.3.1/src/LICENSE) | Monad classes for transformers, using functional dependencies | `adjunctions`, `either`, `exceptions`, `free`, `kan-extensions`, `lens` |
+| `kan-extensions` | [`5.2.8`](http://hackage.haskell.org/package/kan-extensions-5.2.8) | [`BSD-3-Clause`](http://hackage.haskell.org/package/kan-extensions-5.2.8/src/LICENSE) | Kan extensions, Kan lifts, the Yoneda lemma, and (co)density (co)monads | `yaya` |
+| **`mtl`** | [`2.3.1`](http://hackage.haskell.org/package/mtl-2.3.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/mtl-2.3.1/src/LICENSE) | Monad classes for transformers, using functional dependencies | `adjunctions`, `either`, `exceptions`, `free`, `kan-extensions` |
 | **`os-string`** | [`2.0.2`](http://hackage.haskell.org/package/os-string-2.0.2) | [`BSD-3-Clause`](http://hackage.haskell.org/package/os-string-2.0.2/src/LICENSE) | Library for manipulating Operating system strings. | `directory`, `filepath`, `hashable`, `unix` |
-| `parallel` | [`3.3.0.0`](http://hackage.haskell.org/package/parallel-3.3.0.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/parallel-3.3.0.0/src/LICENSE) | Parallel programming library | `lens` |
 | **`pretty`** | [`1.1.3.6`](http://hackage.haskell.org/package/pretty-1.1.3.6) | [`BSD-3-Clause`](http://hackage.haskell.org/package/pretty-1.1.3.6/src/LICENSE) | Pretty-printing library | `template-haskell` |
-| `primitive` | [`0.9.1.0`](http://hackage.haskell.org/package/primitive-0.9.1.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/primitive-0.9.1.0/src/LICENSE) | Primitive memory-related operations | `vector` |
 | **`process`** | [`1.6.19.0`](http://hackage.haskell.org/package/process-1.6.19.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/process-1.6.19.0/src/LICENSE) | Process libraries | `ghc` |
-| `profunctors` | [`5.6.3`](http://hackage.haskell.org/package/profunctors-5.6.3) | [`BSD-3-Clause`](http://hackage.haskell.org/package/profunctors-5.6.3/src/LICENSE) | Profunctors | `adjunctions`, `either`, `free`, `invariant`, `kan-extensions`, `lens`, `yaya` |
-| `reflection` | [`2.1.9`](http://hackage.haskell.org/package/reflection-2.1.9) | [`BSD-3-Clause`](http://hackage.haskell.org/package/reflection-2.1.9/src/LICENSE) | Reifies arbitrary terms into types that can be reflected back into terms | `lens` |
+| `profunctors` | [`5.6.3`](http://hackage.haskell.org/package/profunctors-5.6.3) | [`BSD-3-Clause`](http://hackage.haskell.org/package/profunctors-5.6.3/src/LICENSE) | Profunctors | `adjunctions`, `either`, `free`, `invariant`, `kan-extensions`, `yaya` |
 | **`semaphore-compat`** | [`1.0.0`](http://hackage.haskell.org/package/semaphore-compat-1.0.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/semaphore-compat-1.0.0) | Cross-platform abstraction for system semaphores | `ghc` |
-| `semigroupoids` | [`6.0.2`](http://hackage.haskell.org/package/semigroupoids-6.0.2) | [`BSD-2-Clause`](http://hackage.haskell.org/package/semigroupoids-6.0.2/src/LICENSE) | Semigroupoids: Category sans id | `adjunctions`, `either`, `free`, `kan-extensions`, `lens` |
+| `semigroupoids` | [`6.0.2`](http://hackage.haskell.org/package/semigroupoids-6.0.2) | [`BSD-2-Clause`](http://hackage.haskell.org/package/semigroupoids-6.0.2/src/LICENSE) | Semigroupoids: Category sans id | `adjunctions`, `either`, `free`, `kan-extensions` |
 | **`stm`** | [`2.5.3.1`](http://hackage.haskell.org/package/stm-2.5.3.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/stm-2.5.3.1/src/LICENSE) | Software Transactional Memory | `StateVar`, `exceptions`, `ghc`, `invariant`, `transformers-base` |
-| `strict` | [`0.5.1`](http://hackage.haskell.org/package/strict-0.5.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/strict-0.5.1/src/LICENSE) | Strict data types and String IO. | `lens`, `yaya` |
-| `tagged` | [`0.8.10`](http://hackage.haskell.org/package/tagged-0.8.10) | [`BSD-3-Clause`](http://hackage.haskell.org/package/tagged-0.8.10/src/LICENSE) | Haskell 98 phantom types to avoid unsafely passing dummy arguments | `adjunctions`, `bifunctors`, `comonad`, `distributive`, `indexed-traversable-instances`, `invariant`, `lens`, `profunctors`, `semigroupoids` |
-| **`template-haskell`** | [`2.22.0.0`](http://hackage.haskell.org/package/template-haskell-2.22.0.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/template-haskell-2.22.0.0/src/LICENSE) | Support library for Template Haskell | `OneTuple`, `bifunctors`, `bytestring`, `containers`, `exceptions`, `filepath`, `free`, `ghc`, `ghci`, `invariant`, `lens`, `os-string`, `primitive`, `reflection`, `semigroupoids`, `tagged`, `text`, `th-abstraction`, `unordered-containers`, `yaya` |
-| **`text`** | [`2.1.1`](http://hackage.haskell.org/package/text-2.1.1) | [`BSD-2-Clause`](http://hackage.haskell.org/package/text-2.1.1/src/LICENSE) | An efficient packed Unicode text type. | `hashable`, `lens`, `strict` |
-| `th-abstraction` | [`0.7.2.0`](http://hackage.haskell.org/package/th-abstraction-0.7.2.0) | [`ISC`](http://hackage.haskell.org/package/th-abstraction-0.7.2.0/src/LICENSE) | Nicer interface for reified information about data types | `bifunctors`, `free`, `invariant`, `lens`, `yaya` |
-| `these` | [`1.2.1`](http://hackage.haskell.org/package/these-1.2.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/these-1.2.1/src/LICENSE) | An either-or-both data type. | `lens`, `strict` |
+| `strict` | [`0.5.1`](http://hackage.haskell.org/package/strict-0.5.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/strict-0.5.1/src/LICENSE) | Strict data types and String IO. | `yaya` |
+| `tagged` | [`0.8.10`](http://hackage.haskell.org/package/tagged-0.8.10) | [`BSD-3-Clause`](http://hackage.haskell.org/package/tagged-0.8.10/src/LICENSE) | Haskell 98 phantom types to avoid unsafely passing dummy arguments | `adjunctions`, `bifunctors`, `comonad`, `distributive`, `invariant`, `profunctors`, `semigroupoids` |
+| **`template-haskell`** | [`2.22.0.0`](http://hackage.haskell.org/package/template-haskell-2.22.0.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/template-haskell-2.22.0.0/src/LICENSE) | Support library for Template Haskell | `bifunctors`, `bytestring`, `containers`, `exceptions`, `filepath`, `free`, `ghc`, `ghci`, `invariant`, `os-string`, `semigroupoids`, `tagged`, `text`, `th-abstraction`, `unordered-containers`, `yaya` |
+| **`text`** | [`2.1.1`](http://hackage.haskell.org/package/text-2.1.1) | [`BSD-2-Clause`](http://hackage.haskell.org/package/text-2.1.1/src/LICENSE) | An efficient packed Unicode text type. | `hashable`, `strict` |
+| `th-abstraction` | [`0.7.2.0`](http://hackage.haskell.org/package/th-abstraction-0.7.2.0) | [`ISC`](http://hackage.haskell.org/package/th-abstraction-0.7.2.0/src/LICENSE) | Nicer interface for reified information about data types | `bifunctors`, `free`, `invariant`, `yaya` |
+| `these` | [`1.2.1`](http://hackage.haskell.org/package/these-1.2.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/these-1.2.1/src/LICENSE) | An either-or-both data type. | `strict` |
 | **`time`** | [`1.12.2`](http://hackage.haskell.org/package/time-1.12.2) | [`BSD-2-Clause`](http://hackage.haskell.org/package/time-1.12.2/src/LICENSE) | A time library | `directory`, `ghc`, `hpc`, `unix` |
-| **`transformers`** | [`0.6.1.1`](http://hackage.haskell.org/package/transformers-0.6.1.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/transformers-0.6.1.1/src/LICENSE) | Concrete functor and monad transformers | `StateVar`, `adjunctions`, `comonad`, `contravariant`, `distributive`, `exceptions`, `free`, `ghc`, `ghci`, `indexed-traversable`, `invariant`, `kan-extensions`, `lens`, `mtl`, `primitive`, `profunctors`, `semigroupoids`, `strict`, `transformers-base`, `transformers-compat`, `yaya` |
-| `transformers-base` | [`0.4.6`](http://hackage.haskell.org/package/transformers-base-0.4.6) | [`BSD-3-Clause`](http://hackage.haskell.org/package/transformers-base-0.4.6/src/LICENSE) | Lift computations from the bottom of a transformer stack | `free` |
+| **`transformers`** | [`0.6.1.1`](http://hackage.haskell.org/package/transformers-0.6.1.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/transformers-0.6.1.1/src/LICENSE) | Concrete functor and monad transformers | `StateVar`, `adjunctions`, `comonad`, `contravariant`, `distributive`, `exceptions`, `free`, `ghc`, `ghci`, `indexed-traversable`, `invariant`, `kan-extensions`, `mtl`, `profunctors`, `semigroupoids`, `strict`, `transformers-base`, `transformers-compat`, `yaya` |
+| `transformers-base` | [`0.4.6.1`](http://hackage.haskell.org/package/transformers-base-0.4.6.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/transformers-base-0.4.6.1/src/LICENSE) | Lift computations from the bottom of a transformer stack | `free` |
 | `transformers-compat` | [`0.7.2`](http://hackage.haskell.org/package/transformers-compat-0.7.2) | [`BSD-3-Clause`](http://hackage.haskell.org/package/transformers-compat-0.7.2/src/LICENSE) | A small compatibility shim for the transformers library | `semigroupoids`, `transformers-base` |
 | **`unix`** | [`2.8.5.1`](http://hackage.haskell.org/package/unix-2.8.5.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/unix-2.8.5.1/src/LICENSE) | POSIX functionality | `directory`, `ghc`, `ghc-boot`, `ghci`, `process`, `semaphore-compat` |
-| `unordered-containers` | [`0.2.21`](http://hackage.haskell.org/package/unordered-containers-0.2.21) | [`BSD-3-Clause`](http://hackage.haskell.org/package/unordered-containers-0.2.21/src/LICENSE) | Efficient hashing-based container types | `indexed-traversable-instances`, `invariant`, `lens`, `semigroupoids` |
-| `vector` | [`0.13.2.0`](http://hackage.haskell.org/package/vector-0.13.2.0) | [`BSD-3-Clause`](http://hackage.haskell.org/package/vector-0.13.2.0/src/LICENSE) | Efficient Arrays | `indexed-traversable-instances`, `lens` |
-| `vector-stream` | [`0.1.0.1`](http://hackage.haskell.org/package/vector-stream-0.1.0.1) | [`BSD-3-Clause`](http://hackage.haskell.org/package/vector-stream-0.1.0.1/src/LICENSE) | Efficient Streams | `vector` |
+| `unordered-containers` | [`0.2.21`](http://hackage.haskell.org/package/unordered-containers-0.2.21) | [`BSD-3-Clause`](http://hackage.haskell.org/package/unordered-containers-0.2.21/src/LICENSE) | Efficient hashing-based container types | `invariant`, `semigroupoids` |
 
diff --git a/src/Yaya/Unsafe/Applied.hs b/src/Yaya/Unsafe/Applied.hs
--- a/src/Yaya/Unsafe/Applied.hs
+++ b/src/Yaya/Unsafe/Applied.hs
@@ -5,7 +5,7 @@
   )
 where
 
-import "yaya" Yaya.Fold (Steppable (embed))
+import "yaya" Yaya.Fold (Steppable, embed)
 import "yaya" Yaya.Pattern (XNor)
 import "this" Yaya.Unsafe.Fold (unsafeCata)
 
diff --git a/src/Yaya/Unsafe/Fold.hs b/src/Yaya/Unsafe/Fold.hs
--- a/src/Yaya/Unsafe/Fold.hs
+++ b/src/Yaya/Unsafe/Fold.hs
@@ -4,7 +4,6 @@
 --   laziness) can lead to non-termination.
 module Yaya.Unsafe.Fold
   ( anaM,
-    corecursivePrism,
     ganaM,
     ghylo,
     ghyloM,
@@ -18,47 +17,47 @@
   )
 where
 
-import "base" Control.Applicative (Applicative (pure))
-import "base" Control.Category (Category ((.)))
+import "base" Control.Applicative (pure)
+import "base" Control.Category ((.))
 import "base" Control.Monad (Monad, (<=<))
 import "base" Data.Function (flip, ($))
-import "base" Data.Functor (Functor (fmap))
-import "base" Data.Functor.Compose (Compose (Compose, getCompose))
-import "base" Data.Traversable (Traversable (sequenceA))
-import "comonad" Control.Comonad (Comonad (extract))
-import "lens" Control.Lens (Prism', matching, prism, review)
+import "base" Data.Functor (Functor, fmap)
+import "base" Data.Functor.Compose (Compose (Compose), getCompose)
+import "base" Data.Traversable (Traversable, sequenceA)
+import "comonad" Control.Comonad (Comonad, extract)
 import "yaya" Yaya.Fold
   ( Algebra,
     AlgebraM,
     Coalgebra,
     CoalgebraM,
-    CoalgebraPrism,
-    Corecursive (ana),
+    Corecursive,
     DistributiveLaw,
     GAlgebra,
     GAlgebraM,
     GCoalgebra,
     GCoalgebraM,
-    Projectable (project),
-    Recursive (cata),
-    Steppable (embed),
+    Projectable,
+    Steppable,
+    ana,
+    embed,
     lowerAlgebra,
     lowerAlgebraM,
     lowerCoalgebra,
     lowerCoalgebraM,
+    project,
   )
 import "yaya" Yaya.Pattern (Maybe, Pair, maybe, uncurry)
 
 -- | Instances leak transitively, so while "Yaya.Unsafe.Fold.Instances" exists,
 --   it should only be used when it is unavoidable. If you are explicitly
---   folding a structure unsafely, use this function instead of importing that
+--   unfolding a structure unsafely, use this function instead of importing that
 --   module.
 unsafeAna :: (Steppable (->) t f, Functor f) => Coalgebra (->) f a -> a -> t
 unsafeAna = hylo embed
 
 -- | Instances leak transitively, so while "Yaya.Unsafe.Fold.Instances" exists,
 --   it should only be used when it is unavoidable. If you are explicitly
---   unfolding a structure unsafely, use this function instead of importing that
+--   folding a structure unsafely, use this function instead of importing that
 --   module.
 --
 --   Should one prefer `unsafeAna` or `unsafeCata` in cases where both are
@@ -262,9 +261,3 @@
 streamGApo flush process accum =
   stream' process $
     \state cont -> maybe (ana flush state) (uncurry cont) . accum
-
-corecursivePrism ::
-  (Steppable (->) t f, Recursive (->) t f, Traversable f) =>
-  CoalgebraPrism f a ->
-  Prism' a t
-corecursivePrism alg = prism (cata $ review alg) (anaM $ matching alg)
diff --git a/src/Yaya/Unsafe/Fold/Instances.hs b/src/Yaya/Unsafe/Fold/Instances.hs
--- a/src/Yaya/Unsafe/Fold/Instances.hs
+++ b/src/Yaya/Unsafe/Fold/Instances.hs
@@ -1,4 +1,6 @@
 {-# LANGUAGE CPP #-}
+{-# LANGUAGE TypeFamilies #-}
+{-# OPTIONS_GHC -Wno-orphans #-}
 
 -- __NB__: base-4.17 moves `IsList` to its own module, which avoids the unsafety
 --         of importing "GHC.Exts". With prior versions of base, we at least
@@ -8,8 +10,6 @@
 #else
 {-# LANGUAGE Trustworthy #-}
 #endif
-{-# LANGUAGE TypeFamilies #-}
-{-# OPTIONS_GHC -Wno-orphans #-}
 
 -- | Type class instances that use direct recursion in a potentially partial
 --   way. This is separated from the rest of `Yaya.Unsafe.Fold` because you can
@@ -20,38 +20,28 @@
 --   This contains instances that you might /expect/ to see, but which aren’t
 --   actually total. For example, folding a lazy list @[a]@ is /not/ guaranteed
 --   to terminate.
-module Yaya.Unsafe.Fold.Instances
-  ( seqFreeT,
-  )
-where
+module Yaya.Unsafe.Fold.Instances () where
 
-import safe "base" Control.Category (Category ((.)))
-import safe "base" Data.Eq (Eq ((==)))
+import safe "base" Data.Eq (Eq, (==))
 import safe "base" Data.Foldable (Foldable)
 import safe "base" Data.Function (flip)
-import safe "base" Data.Functor (Functor, (<$>))
+import safe "base" Data.Functor (Functor)
 import safe "base" Data.Functor.Classes (Eq1, Ord1, Show1)
 import safe "base" Data.List.NonEmpty (NonEmpty)
-import safe "base" Data.Ord (Ord (compare))
-
--- See comment on @{-# LANGUAGE Safe #-}@ above.
-#if MIN_VERSION_base(4, 17, 0)
-import "base" GHC.IsList (IsList (Item, fromList, fromListN, toList))
-#else
-import "base" GHC.Exts (IsList (Item, fromList, fromListN, toList))
-#endif
-import safe "base" Text.Show (Show (showsPrec))
+import safe "base" Data.Ord (Ord, compare)
+import safe "base" Text.Show (Show, showsPrec)
 import safe "comonad" Control.Comonad.Env (EnvT)
 import safe "free" Control.Comonad.Cofree (Cofree)
-import safe "free" Control.Monad.Trans.Free (Free, FreeF (Free, Pure), free)
+import safe "free" Control.Monad.Trans.Free (Free, FreeF)
 import safe "yaya" Yaya.Fold
-  ( Corecursive (ana),
-    DistributiveLaw,
+  ( Corecursive,
     Mu,
     Nu,
-    Projectable (project),
-    Recursive (cata),
-    Steppable (embed),
+    Recursive,
+    ana,
+    cata,
+    embed,
+    project,
     recursiveCompare,
     recursiveEq,
     recursiveShowsPrec,
@@ -61,6 +51,13 @@
 import safe "this" Yaya.Unsafe.Applied (unsafeFromList)
 import safe qualified "this" Yaya.Unsafe.Fold as Unsafe
 
+-- See comment on @{-# LANGUAGE Safe #-}@ above.
+#if MIN_VERSION_base(4, 17, 0)
+import "base" GHC.IsList (IsList (Item, fromList, fromListN, toList))
+#else
+import "base" GHC.Exts (IsList (Item, fromList, fromListN, toList))
+#endif
+
 instance (Functor f) => Corecursive (->) (Fix f) f where
   ana = Unsafe.hylo embed
 
@@ -69,6 +66,7 @@
 
 instance (Functor f, Foldable f, Eq1 f) => Eq (Cofix f) where
   (==) = recursiveEq
+  {-# INLINEABLE (==) #-}
 
 -- | @since 0.4.1.0
 instance (Functor f, Foldable f, Ord1 f) => Ord (Cofix f) where
@@ -79,12 +77,14 @@
 
 instance (Functor f) => Corecursive (->) (Mu f) f where
   ana = Unsafe.unsafeAna
+  {-# INLINEABLE ana #-}
 
 instance (Functor f) => Recursive (->) (Nu f) f where
   cata = Unsafe.unsafeCata
 
 instance (Functor f, Foldable f, Eq1 f) => Eq (Nu f) where
   (==) = recursiveEq
+  {-# INLINEABLE (==) #-}
 
 -- | @since 0.4.1.0
 instance (Functor f, Foldable f, Ord1 f) => Ord (Nu f) where
@@ -104,19 +104,6 @@
 
 instance (Functor f) => Recursive (->) (Free f a) (FreeF f a) where
   cata = Unsafe.unsafeCata
-
--- TODO: If we can generalize this to an arbitrary 'Recursive (->) t (FreeF h a)'
---       then it would no longer be unsafe.
-seqFreeT ::
-  (Functor f, Functor h) =>
-  DistributiveLaw (->) h f ->
-  DistributiveLaw (->) (Free h) f
-seqFreeT k =
-  cata
-    ( \case
-        Pure a -> free . Pure <$> a
-        Free ft -> free . Free <$> k ft
-    )
 
 -- | `fromList` in this instance is unsafe, but `fromListN` is safe, because we
 --   have a finite length to fold.
diff --git a/src/Yaya/Unsafe/Zoo.hs b/src/Yaya/Unsafe/Zoo.hs
--- a/src/Yaya/Unsafe/Zoo.hs
+++ b/src/Yaya/Unsafe/Zoo.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE QuantifiedConstraints #-}
 {-# LANGUAGE Safe #-}
 
 module Yaya.Unsafe.Zoo
@@ -8,7 +9,6 @@
     dyna,
     elgot,
     fstream,
-    futu,
     gpostpro,
     gprepro,
     stream,
@@ -16,72 +16,109 @@
   )
 where
 
-import "base" Control.Applicative (Applicative (pure))
-import "base" Control.Category (Category (id, (.)))
+import "base" Control.Applicative (pure)
+import "base" Control.Category (id, (.))
 import "base" Control.Monad (Monad)
-import "base" Data.Bifunctor (Bifunctor (second))
-import "base" Data.Bitraversable (Bitraversable (bitraverse))
+import "base" Data.Bifunctor (second)
+import "base" Data.Bitraversable (Bitraversable, bitraverse)
 import "base" Data.Function (const, flip)
-import "base" Data.Functor (Functor (fmap))
-import "base" Data.Functor.Compose (Compose (Compose, getCompose))
-import "base" Data.Functor.Identity (Identity (Identity, runIdentity))
+import "base" Data.Functor (Functor, fmap)
+import "base" Data.Functor.Compose (Compose (Compose), getCompose)
+import "base" Data.Functor.Identity (Identity (Identity), runIdentity)
 import "base" Data.Traversable (Traversable)
 import "comonad" Control.Comonad (Comonad)
 import "comonad" Control.Comonad.Env (EnvT)
-import "free" Control.Comonad.Cofree (Cofree)
-import "free" Control.Monad.Trans.Free (Free)
+import "free" Control.Monad.Trans.Free (FreeF)
 import "yaya" Yaya.Fold
   ( Algebra,
     Coalgebra,
-    Corecursive (ana),
+    Corecursive,
     DistributiveLaw,
     ElgotAlgebra,
     ElgotCoalgebra,
     GAlgebra,
     GCoalgebra,
-    Projectable (project),
-    Recursive (cata),
-    Steppable (embed),
+    Projectable,
+    Recursive,
+    Steppable,
+    ana,
+    cata,
+    distCofreeT,
     distEnvT,
     distIdentity,
-    gana,
+    embed,
+    project,
+    seqFreeT,
     seqIdentity,
   )
 import "yaya" Yaya.Fold.Common (diagonal, fromEither)
-import "yaya" Yaya.Fold.Native (distCofreeT)
-import "yaya" Yaya.Pattern (Either, Maybe (Nothing), Pair ((:!:)), XNor (Both, Neither))
+import "yaya" Yaya.Fold.Native ()
+import "yaya" Yaya.Pattern
+  ( Either,
+    Maybe (Nothing),
+    Pair ((:!:)),
+    XNor (Both, Neither),
+  )
 import qualified "this" Yaya.Unsafe.Fold as Unsafe
-import qualified "this" Yaya.Unsafe.Fold.Instances as Unsafe -- FIXME: extremely unsafe
 
 chrono ::
-  (Functor f) =>
-  GAlgebra (->) (Cofree f) f b ->
-  GCoalgebra (->) (Free f) f a ->
+  ( Functor f,
+    forall x. Corecursive (->) (cofreef x) (EnvT x f),
+    forall x. Projectable (->) (cofreef x) (EnvT x f),
+    forall x. Recursive (->) (freef x) (FreeF f x),
+    forall x. Steppable (->) (freef x) (FreeF f x),
+    Comonad cofreef,
+    Monad freef
+  ) =>
+  GAlgebra (->) cofreef f b ->
+  GCoalgebra (->) freef f a ->
   a ->
   b
-chrono = Unsafe.ghylo (distCofreeT id) (Unsafe.seqFreeT id)
+chrono = Unsafe.ghylo (distCofreeT id) (seqFreeT id)
 
-codyna :: (Functor f) => Algebra (->) f b -> GCoalgebra (->) (Free f) f a -> a -> b
-codyna φ = Unsafe.ghylo distIdentity (Unsafe.seqFreeT id) (φ . fmap runIdentity)
+codyna ::
+  ( Functor f,
+    forall x. Recursive (->) (freef x) (FreeF f x),
+    forall x. Steppable (->) (freef x) (FreeF f x),
+    Monad freef
+  ) =>
+  Algebra (->) f b ->
+  GCoalgebra (->) freef f a ->
+  a ->
+  b
+codyna φ = Unsafe.ghylo distIdentity (seqFreeT id) (φ . fmap runIdentity)
 
--- | [Recursion Schemes for Dynamic Programming](https://www.researchgate.net/publication/221440162_Recursion_Schemes_for_Dynamic_Programming)
-dyna :: (Functor f) => GAlgebra (->) (Cofree f) f b -> Coalgebra (->) f a -> a -> b
+-- | [Recursion Schemes for Dynamic
+--   Programming](https://www.researchgate.net/publication/221440162_Recursion_Schemes_for_Dynamic_Programming)
+dyna ::
+  ( Functor f,
+    forall x. Corecursive (->) (cofreef x) (EnvT x f),
+    forall x. Projectable (->) (cofreef x) (EnvT x f),
+    Comonad cofreef
+  ) =>
+  GAlgebra (->) cofreef f b ->
+  Coalgebra (->) f a ->
+  a ->
+  b
 dyna φ ψ = Unsafe.ghylo (distCofreeT id) seqIdentity φ (fmap Identity . ψ)
 
 -- | Unlike most `Unsafe.hylo`s, `elgot` composes an algebra and coalgebra in a
 --   way that allows information to move between them. The coalgebra can return,
 --   effectively, a pre-folded branch, short-circuiting parts of the process.
-elgot :: (Functor f) => Algebra (->) f b -> ElgotCoalgebra (->) (Either b) f a -> a -> b
+elgot ::
+  (Functor f) =>
+  Algebra (->) f b ->
+  ElgotCoalgebra (->) (Either b) f a ->
+  a ->
+  b
 elgot φ ψ = Unsafe.hylo (fromEither . second φ . getCompose) (Compose . ψ)
 
 -- | The dual of `elgot`, `coelgot` allows the /algebra/ to short-circuit in
 --   some cases – operating directly on a part of the seed.
-coelgot :: (Functor f) => ElgotAlgebra (->) (Pair a) f b -> Coalgebra (->) f a -> a -> b
+coelgot ::
+  (Functor f) => ElgotAlgebra (->) (Pair a) f b -> Coalgebra (->) f a -> a -> b
 coelgot φ ψ = Unsafe.hylo (φ . getCompose) (Compose . second ψ . diagonal)
 
-futu :: (Corecursive (->) t f, Functor f) => GCoalgebra (->) (Free f) f a -> a -> t
-futu = gana (Unsafe.seqFreeT id)
-
 gprepro ::
   (Steppable (->) t f, Recursive (->) t f, Functor f, Comonad w) =>
   DistributiveLaw (->) f w ->
@@ -152,11 +189,18 @@
   m u
 cotraverse f = Unsafe.anaM (bitraverse f pure . project)
 
--- | Zygohistomorphic prepromorphism – everyone’s favorite recursion scheme joke.
+-- | Zygohistomorphic prepromorphism – everyone’s favorite recursion scheme
+--   joke.
 zygoHistoPrepro ::
-  (Steppable (->) t f, Recursive (->) t f, Functor f) =>
+  ( Steppable (->) t f,
+    Recursive (->) t f,
+    forall x. Corecursive (->) (cofreef x) (EnvT x f),
+    forall x. Projectable (->) (cofreef x) (EnvT x f),
+    Functor f,
+    Comonad cofreef
+  ) =>
   (f b -> b) ->
-  (f (EnvT b (Cofree f) a) -> a) ->
+  (f (EnvT b cofreef a) -> a) ->
   (forall c. f c -> f c) ->
   t ->
   a
diff --git a/tests/Test/Fold.hs b/tests/Test/Fold.hs
--- a/tests/Test/Fold.hs
+++ b/tests/Test/Fold.hs
@@ -5,7 +5,7 @@
 
 module Test.Fold (tests) where
 
-import safe "base" Control.Category (Category (id))
+import safe "base" Control.Category (id)
 import safe "base" Control.Monad ((=<<))
 import safe "base" Data.Bool (Bool)
 import safe "base" Data.Function (($))
diff --git a/yaya-unsafe.cabal b/yaya-unsafe.cabal
--- a/yaya-unsafe.cabal
+++ b/yaya-unsafe.cabal
@@ -3,7 +3,7 @@
 --   exception.
 
 name: yaya-unsafe
-version: 0.5.0.0
+version: 1.0.0.0
 synopsis: Non-total extensions to the Yaya recursion scheme library.
 description: Yaya is designed as a _total_ library. However, it is often
              expedient to use partial operations in some cases, and this package
@@ -55,7 +55,7 @@
   location: https://github.com/sellout/yaya.git
   subdir: unsafe
   -- NB: This is the repo version, which is distinct from the package version.
-  tag: v4.0.0
+  tag: v5.0.0
 
 custom-setup
   setup-depends:
@@ -149,8 +149,6 @@
     base ^>= {4.13.0, 4.14.0, 4.15.0, 4.16.0, 4.17.0, 4.18.0, 4.19.0, 4.20.0, 4.21.0, 4.22.0},
   ghc-options:
     -Weverything
-    -- This one just reports unfixable things, AFAICT.
-    -Wno-all-missed-specialisations
     -- Type inference good.
     -Wno-missing-local-signatures
     -- Warns even when `Unsafe` is explicit, not inferred. See
@@ -176,6 +174,12 @@
       -Wno-missing-poly-kind-signatures
       -- Inference good.
       -Wno-missing-role-annotations
+  -- remove if the oldest supported version is GHC 9.14.1+
+  if impl(ghc >= 9.14.1)
+    ghc-options:
+      -- See
+      -- https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0581-namespace-specified-imports.rst#deprecate-use-of-pattern-in-import-export-lists
+      -Wno-pattern-namespace-specifier
   default-extensions:
     BlockArguments
     DefaultSignatures
@@ -214,8 +218,7 @@
   build-depends:
     comonad ^>= 5.0.7,
     free ^>= {5.1.5, 5.2},
-    lens ^>= {5, 5.1, 5.2, 5.3},
-    yaya ^>= {0.5.1, 0.6.0, 0.7.0},
+    yaya ^>= {0.5.1, 0.6.0, 0.7.0, 1.0.0},
   exposed-modules:
     Yaya.Unsafe.Applied
     Yaya.Unsafe.Fold
@@ -263,8 +266,8 @@
     Test.Fold
   build-depends:
     hedgehog ^>= {1.0.1, 1.1, 1.2, 1.4, 1.5, 1.7},
-    yaya ^>= {0.5.1, 0.6.0, 0.7.0},
-    yaya-hedgehog ^>= {0.2.1, 0.3.0, 0.4.0},
+    yaya ^>= {0.5.1, 0.6.0, 0.7.0, 1.0.0},
+    yaya-hedgehog ^>= {0.2.1, 0.3.0, 0.4.0, 1.0.0},
     yaya-unsafe,
   ghc-options:
     -- NB: Need `-fno-omit-yields` so that `timeout` can interrupt native
