diff --git a/formatn.cabal b/formatn.cabal
--- a/formatn.cabal
+++ b/formatn.cabal
@@ -1,6 +1,6 @@
 cabal-version: 2.4
 name:          formatn
-version:       0.2.1
+version:       0.2.2
 synopsis:      Formatting of doubles.
 description:
   This package provides support for number formatting styles, especially styles involving significant figure calculations.
@@ -20,6 +20,7 @@
 license:       BSD-3-Clause
 license-file:  LICENSE
 build-type:    Simple
+tested-with:   GHC ==8.6.5 || ==8.8.4 || ==8.10.7 || ==9.2.5 || ==9.4.4
 
 source-repository head
   type:     git
@@ -30,15 +31,15 @@
   default-extensions:
   ghc-options:
     -Wall -Wcompat -Wincomplete-record-updates
-    -Wincomplete-uni-patterns -Wredundant-constraints -fwrite-ide-info
-    -hiedir=.hie
+    -Wincomplete-uni-patterns -Wredundant-constraints
 
   build-depends:
-    , base        >=4.7 && <5
+    , base        >=4.7  && <5
     , containers  ^>=0.6
-    , text        ^>=1.2
-    -- just for cabal-docspec --check-properties
     , QuickCheck
+    , text        >=1.2  && <2.1
+
+  -- just for cabal-docspec --check-properties
   exposed-modules:    Data.FormatN
   other-modules:
   default-language:   Haskell2010
diff --git a/src/Data/FormatN.hs b/src/Data/FormatN.hs
--- a/src/Data/FormatN.hs
+++ b/src/Data/FormatN.hs
@@ -194,7 +194,7 @@
 
 -- | expt format for a SigFig
 exptSF :: SigFig -> Text
-exptSF (SigFig s i e) = pack $ sfsign s <> bool (i'' <> "e" <> show e') "0" (i==0)
+exptSF (SigFig s i e) = pack $ sfsign s <> bool (i'' <> "e" <> show e') "0" (i == 0)
   where
     i''
       | length i' == 1 = i'
@@ -215,7 +215,7 @@
 exptSFWith :: Maybe Int -> SigFig -> Text
 exptSFWith eover (SigFig s i e) = pack (sfsign s) <> posDecimalSF i (e - e') <> "e" <> pack (show e')
   where
-    e' = fromMaybe (bool (e + length (show i) - 1) 0 (i==0)) eover
+    e' = fromMaybe (bool (e + length (show i) - 1) 0 (i == 0)) eover
 
 -- Formatting the positive component in decimal style
 posDecimalSF :: Integer -> Int -> Text
@@ -404,7 +404,7 @@
 
     expXs = major [x | (ExponentStyle x) <- s <$> xs]
 
-major :: Ord a => [a] -> Maybe a
+major :: (Ord a) => [a] -> Maybe a
 major xs = fst <$> listToMaybe (List.sortOn (Down . snd) $ Map.toList $ Map.fromListWith (+) ((,1 :: Integer) <$> xs))
 
 -- | format a number according to a FormatStyle and significant figures