diff --git a/package.yaml b/package.yaml
index 91f40e0..70fb2cf 100644
--- a/package.yaml
+++ b/package.yaml
@@ -28,6 +28,9 @@ default-extensions:
 
 dependencies:
   - base
+  - containers
+  - text
+  - vector
   - QuickCheck
 
 ghc-options:
@@ -37,11 +40,6 @@ ghc-options:
 
 library:
   source-dirs: src
-  dependencies:
-    - containers
-    - leancheck
-    - text
-    - vector
 
 executables:
   scalie-exe:
@@ -66,5 +64,3 @@ tests:
     - scalie
     - tasty
     - tasty-quickcheck
-    - tasty-leancheck
-    - template-haskell
diff --git a/scalie.cabal b/scalie.cabal
index 6764e9c..5d04b75 100644
--- a/scalie.cabal
+++ b/scalie.cabal
@@ -19,7 +19,6 @@ extra-source-files:
 
 library
   exposed-modules:
-      Data.Enum.Util
       Data.Map.Implicit
       Language.Scalie.Bytecode.Instruction
       Language.Scalie.Bytecode.Object
@@ -40,8 +39,6 @@ library
       Language.Scalie.Core.Provenance
       Language.Scalie.Core.Provenance.SourceLocation
       Language.Scalie.Domain.Type
-      Language.Scalie.Domain.Type.Function
-      Language.Scalie.Domain.Type.Function.ArgumentModification
   other-modules:
       Paths_scalie
   hs-source-dirs:
@@ -58,7 +55,6 @@ library
       QuickCheck
     , base
     , containers
-    , leancheck
     , text
     , vector
   default-language: Haskell2010
@@ -80,7 +76,10 @@ executable scalie-exe
   build-depends:
       QuickCheck
     , base
+    , containers
     , scalie
+    , text
+    , vector
   default-language: Haskell2010
 
 test-suite scalie-test
@@ -88,10 +87,7 @@ test-suite scalie-test
   main-is: Spec.hs
   other-modules:
       Test.Data.Map.Implicit
-      Test.Language.Scalie.Domain.Type.Function.ArgumentModification
-      Test.QuickCheck.Isomorphic
       Test.QuickCheck.Roundtrip
-      Test.Tasty.TH
       Paths_scalie
   hs-source-dirs:
       test
@@ -106,9 +102,10 @@ test-suite scalie-test
   build-depends:
       QuickCheck
     , base
+    , containers
     , scalie
     , tasty
-    , tasty-leancheck
     , tasty-quickcheck
-    , template-haskell
+    , text
+    , vector
   default-language: Haskell2010
diff --git a/src/Data/Enum/Util.hs b/src/Data/Enum/Util.hs
deleted file mode 100644
index ddc3971..0000000
--- a/src/Data/Enum/Util.hs
+++ /dev/null
@@ -1,5 +0,0 @@
-{-# LANGUAGE Safe #-}
-module Data.Enum.Util (enumerate) where
-
-enumerate :: (Enum a, Bounded a) => [a]
-enumerate = [minBound .. maxBound]
diff --git a/src/Language/Scalie/Domain/Type.hs b/src/Language/Scalie/Domain/Type.hs
index 55fe978..97354de 100644
--- a/src/Language/Scalie/Domain/Type.hs
+++ b/src/Language/Scalie/Domain/Type.hs
@@ -4,25 +4,17 @@ module Language.Scalie.Domain.Type (Type(..)) where
 
 import Data.Kind qualified
 import Test.QuickCheck (Arbitrary (arbitrary), Gen, oneof)
-import Language.Scalie.Domain.Type.Function qualified as Type
 
 -- | The type of an expression in Scalie, not to be confused with the 'Type' provided by GHC
 
 type Type :: Data.Kind.Type
 data Type
   = RawInt
-  | RawRational
-  | RawString
-  | Function Type.Function
   deriving stock (Show, Read, Eq)
 
   -- add to the arbitrary instance when defining constructors
 
 instance Arbitrary Type where
   arbitrary :: Gen Type
-  arbitrary = oneof 
-    [ pure RawInt
-    , pure RawRational
-    , pure RawString 
-    ]
+  arbitrary = oneof [ pure RawInt ]
 
diff --git a/src/Language/Scalie/Domain/Type.hs-boot b/src/Language/Scalie/Domain/Type.hs-boot
deleted file mode 100644
index 20897d8..0000000
--- a/src/Language/Scalie/Domain/Type.hs-boot
+++ /dev/null
@@ -1,9 +0,0 @@
-{-# LANGUAGE Safe #-}
-module Language.Scalie.Domain.Type (Type) where
-import Data.Kind qualified
-
-type Type :: Data.Kind.Type
-data Type
-instance Show Type
-instance Read Type
-instance Eq   Type
diff --git a/src/Language/Scalie/Domain/Type/Function.hs b/src/Language/Scalie/Domain/Type/Function.hs
deleted file mode 100644
index 233aea1..0000000
--- a/src/Language/Scalie/Domain/Type/Function.hs
+++ /dev/null
@@ -1,18 +0,0 @@
-{-# LANGUAGE Safe #-}
-module Language.Scalie.Domain.Type.Function (Function(..)) where
-
--- meta
-import Data.Kind qualified
-
--- scalie
-import Language.Scalie.Domain.Type.Function.ArgumentModification (ArgumentModification)
-
-import {-# SOURCE #-} Language.Scalie.Domain.Type qualified as Scalie.Domain
-
-type Function :: Data.Kind.Type
-data Function = Function
-  { argument             :: Scalie.Domain.Type
-  , result               :: Scalie.Domain.Type
-  , argumentModification :: ArgumentModification
-  }
-  deriving stock (Show, Read, Eq)
diff --git a/src/Language/Scalie/Domain/Type/Function/ArgumentModification.hs b/src/Language/Scalie/Domain/Type/Function/ArgumentModification.hs
deleted file mode 100644
index 5deb58d..0000000
--- a/src/Language/Scalie/Domain/Type/Function/ArgumentModification.hs
+++ /dev/null
@@ -1,26 +0,0 @@
-{-# LANGUAGE Trustworthy #-} -- leancheck import somehow is not safe
-{-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE InstanceSigs #-}
-module Language.Scalie.Domain.Type.Function.ArgumentModification (ArgumentModification(..), toBool, fromBool) where
-import Data.Kind qualified
-import Test.LeanCheck (Listable (list))
-import Data.Enum.Util (enumerate)
-
-type ArgumentModification :: Data.Kind.Type
-data ArgumentModification
-  = PureArguments
-  | LinearArguments
-  deriving stock (Show, Read, Eq, Ord, Enum, Bounded)
-
-toBool :: ArgumentModification -> Bool
-toBool = \case
-  PureArguments -> False
-  LinearArguments -> True
-
-fromBool :: Bool -> ArgumentModification
-fromBool = toEnum . fromEnum
-
-instance Listable ArgumentModification where
-  list :: [ArgumentModification]
-  list = enumerate
-
diff --git a/test/Spec.hs b/test/Spec.hs
index 6ad4910..58d3a63 100644
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -1,16 +1,10 @@
 {-# LANGUAGE Unsafe #-} -- unsafe: Uses functions imported from unsafe modules
-
--- library
-import Test.Tasty qualified as Tasty
-
--- test groups
 import Test.Data.Map.Implicit qualified
-import Test.Language.Scalie.Domain.Type.Function.ArgumentModification qualified
+import Test.Tasty qualified as Tasty
 
 main :: IO ()
 main = Tasty.defaultMain $ Tasty.testGroup "all"
   [ Tasty.testGroup "Properties"
     [ Test.Data.Map.Implicit.testGroup
-    , Test.Language.Scalie.Domain.Type.Function.ArgumentModification.testGroup
     ]
   ]
diff --git a/test/Test/Data/Map/Implicit.hs b/test/Test/Data/Map/Implicit.hs
index 4f38074..44bbb1f 100644
--- a/test/Test/Data/Map/Implicit.hs
+++ b/test/Test/Data/Map/Implicit.hs
@@ -18,7 +18,6 @@ import Test.Tasty.QuickCheck (QuickCheckMaxSize(QuickCheckMaxSize))
 
 import Test.Tasty qualified as Tasty
 import Test.Tasty.QuickCheck qualified as Tasty.QuickCheck
-import Test.Tasty.TH (moduleName)
 
 -- | This is testworthy since I have somehow hand-hacked the read/show de/serialization of 'ImplicitMap'
 
@@ -33,6 +32,5 @@ allTests :: [(String, Property)]
 allTests = $allProperties
 
 testGroup :: TestTree
-testGroup = Tasty.localOption (QuickCheckMaxSize 5) -- anything above 25 doesn't finish in reasonable time on my laptop
-  $ Tasty.QuickCheck.testProperties $moduleName allTests
-  -- I don't want to stress-tess or bench-mark it, just prove it works cause I hacked a little around it.
+testGroup = Tasty.localOption (QuickCheckMaxSize 25) -- it is necessary to restrain the size because the generated core would get veeeeeery big otherwise
+  $ Tasty.QuickCheck.testProperties "Data.Map.Implicit" allTests
diff --git a/test/Test/Language/Scalie/Domain/Type/Function/ArgumentModification.hs b/test/Test/Language/Scalie/Domain/Type/Function/ArgumentModification.hs
deleted file mode 100644
index 573ecf8..0000000
--- a/test/Test/Language/Scalie/Domain/Type/Function/ArgumentModification.hs
+++ /dev/null
@@ -1,32 +0,0 @@
-{-# LANGUAGE Trustworthy #-}
-{-# LANGUAGE TemplateHaskell #-}
-module Test.Language.Scalie.Domain.Type.Function.ArgumentModification (testGroup) where
-
-import Language.Scalie.Domain.Type.Function.ArgumentModification (ArgumentModification, toBool, fromBool)
-
--- library: QuickCheck
-import Test.QuickCheck.Roundtrip (roundtrips)
-import Test.QuickCheck.Isomorphic (isomorphic)
-
--- library: Tasty
-import Test.Tasty (TestTree)
-import Test.Tasty.TH (moduleName)
-
-import Test.Tasty qualified as Tasty
-import Test.Tasty.LeanCheck qualified as Tasty.LeanCheck
-
-prop_toFromBoolRoundtrips :: Bool -> Bool
-prop_toFromBoolRoundtrips = roundtrips toBool fromBool
-
-prop_IsoToBoolEnumConversion :: ArgumentModification -> Bool
-prop_IsoToBoolEnumConversion = isomorphic toBool (toEnum . fromEnum)
-
-prop_IsoFromBoolEnumConversion :: Bool -> Bool
-prop_IsoFromBoolEnumConversion = isomorphic fromBool (toEnum . fromEnum)
-
-testGroup :: TestTree
-testGroup = Tasty.testGroup $moduleName
-  [ Tasty.LeanCheck.testProperty "id       ≡ toBool . fromBool" prop_toFromBoolRoundtrips
-  , Tasty.LeanCheck.testProperty "toBool   ≡ toEnum . fromEnum" prop_IsoToBoolEnumConversion
-  , Tasty.LeanCheck.testProperty "fromBool ≡ toEnum . fromEnum" prop_IsoFromBoolEnumConversion
-  ]
diff --git a/test/Test/QuickCheck/Isomorphic.hs b/test/Test/QuickCheck/Isomorphic.hs
deleted file mode 100644
index dd47ee9..0000000
--- a/test/Test/QuickCheck/Isomorphic.hs
+++ /dev/null
@@ -1,5 +0,0 @@
-{-# LANGUAGE Safe #-}
-module Test.QuickCheck.Isomorphic (isomorphic) where
-
-isomorphic :: Eq a => (t -> a) -> (t -> a) -> t -> Bool
-isomorphic f g x = f x == g x
diff --git a/test/Test/Tasty/TH.hs b/test/Test/Tasty/TH.hs
deleted file mode 100644
index b1f9e93..0000000
--- a/test/Test/Tasty/TH.hs
+++ /dev/null
@@ -1,11 +0,0 @@
-{-# LANGUAGE Safe #-} -- does template haskell, but no IO inside it
-module Test.Tasty.TH (moduleName) where
-
-import Language.Haskell.TH.Lib (thisModule)
-import Language.Haskell.TH.Syntax (Q, Exp(LitE), ModName(ModName), Lit(StringL), Module (Module))
-
-moduleName :: Q Exp
-moduleName = do
-  Module _ (ModName name) <- thisModule
-  pure . LitE . StringL $ name
-