diff --git a/core/src/Streamly/Internal/Data/Array/Type.hs b/core/src/Streamly/Internal/Data/Array/Type.hs
index e154858ca..e9dca094a 100644
--- a/core/src/Streamly/Internal/Data/Array/Type.hs
+++ b/core/src/Streamly/Internal/Data/Array/Type.hs
@@ -315,11 +315,23 @@ fromStreamD str = unsafeFreeze <$> MA.fromStreamD str
 -------------------------------------------------------------------------------
 
 {-# INLINE clone #-}
-clone :: MonadIO m => Array a -> m (Array a)
+clone ::
+    ( MonadIO m
+#ifdef DEVBUILD
+    , Unbox a
+#endif
+    )
+    => Array a -> m (Array a)
 clone = fmap unsafeFreeze . MA.clone . unsafeThaw
 
 {-# INLINE pinnedClone #-}
-pinnedClone :: MonadIO m => Array a -> m (Array a)
+pinnedClone ::
+    ( MonadIO m
+#ifdef DEVBUILD
+    , Unbox a
+#endif
+    )
+    => Array a -> m (Array a)
 pinnedClone = fmap unsafeFreeze . MA.pinnedClone . unsafeThaw
 
 -------------------------------------------------------------------------------
diff --git a/core/src/Streamly/Internal/Data/MutArray/Type.hs b/core/src/Streamly/Internal/Data/MutArray/Type.hs
index 2e1b26a99..e014a1837 100644
--- a/core/src/Streamly/Internal/Data/MutArray/Type.hs
+++ b/core/src/Streamly/Internal/Data/MutArray/Type.hs
@@ -2098,7 +2098,13 @@ fromListRev xs = fromListRevN (Prelude.length xs) xs
 -------------------------------------------------------------------------------
 
 {-# INLINE cloneAs #-}
-cloneAs :: MonadIO m => PinnedState -> MutArray a -> m (MutArray a)
+cloneAs ::
+    ( MonadIO m
+#ifdef DEVBUILD
+    , Unbox a
+#endif
+    )
+    => PinnedState -> MutArray a -> m (MutArray a)
 cloneAs ps src =
     liftIO $ do
         let startSrc = arrStart src
@@ -2108,11 +2114,23 @@ cloneAs ps src =
         return $ MutArray newArrContents 0 srcLen srcLen
 
 {-# INLINE clone #-}
-clone :: MonadIO m => MutArray a -> m (MutArray a)
+clone ::
+    ( MonadIO m
+#ifdef DEVBUILD
+    , Unbox a
+#endif
+    )
+    => MutArray a -> m (MutArray a)
 clone = cloneAs Unpinned
 
 {-# INLINE pinnedClone #-}
-pinnedClone :: MonadIO m => MutArray a -> m (MutArray a)
+pinnedClone ::
+    ( MonadIO m
+#ifdef DEVBUILD
+    , Unbox a
+#endif
+    )
+    => MutArray a -> m (MutArray a)
 pinnedClone = cloneAs Pinned
 
 -------------------------------------------------------------------------------
diff --git a/core/src/Streamly/Internal/Data/Serialize/Type.hs b/core/src/Streamly/Internal/Data/Serialize/Type.hs
index 695fdb48e..90c009cd7 100644
--- a/core/src/Streamly/Internal/Data/Serialize/Type.hs
+++ b/core/src/Streamly/Internal/Data/Serialize/Type.hs
@@ -271,7 +271,11 @@ instance forall a. Serialize a => Serialize [a] where
               pokeList (acc + 1) o1 xs
         pokeList 0 off1 val
 
-instance Serialize (Array a) where
+instance
+#ifdef DEVBUILD
+    Unbox a =>
+#endif
+  Serialize (Array a) where
     {-# INLINE addSizeTo #-}
     addSizeTo i (Array {..}) = i + (arrEnd - arrStart) + 8
 
diff --git a/core/streamly-core.cabal b/core/streamly-core.cabal
index 35e0eafec..ab861ebef 100644
--- a/core/streamly-core.cabal
+++ b/core/streamly-core.cabal
@@ -444,9 +444,10 @@ library
                     , Streamly.Internal.Data.Time.Clock.Type
 
     if flag(dev)
-      other-modules:
+      exposed-modules:
                         Streamly.Internal.Data.StreamK.Alt
-                      , Streamly.Internal.Data.List
+                        -- XXX Compilation needs to be fixed
+                      -- , Streamly.Internal.Data.List
 
     build-depends:
                     -- streamly-base
diff --git a/src/Streamly/Internal/Data/SmallArray.hs b/src/Streamly/Internal/Data/SmallArray.hs
index a1edc7c8b..c35186059 100644
--- a/src/Streamly/Internal/Data/SmallArray.hs
+++ b/src/Streamly/Internal/Data/SmallArray.hs
@@ -106,7 +106,7 @@ foldr f z arr = runIdentity $ D.foldr f z $ toStreamD arr
 -- of elements use an 'Array' from either "Streamly.Data.Array.Generic" or "Streamly.Data.Array.Foreign".
 {-# INLINE_NORMAL writeN #-}
 writeN :: MonadIO m => Int -> Fold m a (SmallArray a)
-writeN len = FL.Fold step initial extract
+writeN len = FL.Fold step initial extract extract
 
     where
 
diff --git a/src/Streamly/Internal/FileSystem/FD.hs b/src/Streamly/Internal/FileSystem/FD.hs
index 5b62b069d..05189feb0 100644
--- a/src/Streamly/Internal/FileSystem/FD.hs
+++ b/src/Streamly/Internal/FileSystem/FD.hs
@@ -120,7 +120,6 @@ import Control.Monad.IO.Class (MonadIO(..))
 import Data.Word (Word8)
 -- import Foreign.ForeignPtr.Unsafe (unsafeForeignPtrToPtr)
 import Foreign.Ptr (castPtr)
-import Streamly.Internal.Data.Unbox (Unbox)
 -- import System.IO (Handle, hGetBufSome, hPutBuf)
 import System.IO (IOMode)
 import Prelude hiding (read)
@@ -128,7 +127,7 @@ import Prelude hiding (read)
 import qualified GHC.IO.FD as FD
 import qualified GHC.IO.Device as RawIO
 
-import Streamly.Data.Array (Array)
+import Streamly.Data.Array (Array, Unbox)
 import Streamly.Data.Stream (Stream)
 
 import Streamly.Internal.Data.Array (byteLength, unsafeFreeze, asPtrUnsafe)
@@ -149,7 +148,7 @@ import qualified Streamly.Data.Array as A
 import qualified Streamly.Data.Fold as FL
 import qualified Streamly.Internal.Data.MutArray as MArray
     (MutArray(..), asPtrUnsafe, pinnedNewBytes)
-import qualified Streamly.Internal.Data.Stream.Chunked as AS
+import qualified Streamly.Internal.Data.Array.Stream as AS
 import qualified Streamly.Internal.Data.Stream as S
 import qualified Streamly.Internal.Data.Stream as D
     (Stream(..), Step(..))
diff --git a/streamly.cabal b/streamly.cabal
index 7acfb93ad..a067340ac 100644
--- a/streamly.cabal
+++ b/streamly.cabal
@@ -424,9 +424,9 @@ library
                      , Streamly.Internal.FileSystem.FD
 
     if flag(dev)
-        other-modules:  Streamly.Data.SmallArray
+        exposed-modules:  Streamly.Data.SmallArray
                         , Streamly.Internal.Data.SmallArray
-                        , Streamly.Internal.Data.SmallArray.Type
+        other-modules:  Streamly.Internal.Data.SmallArray.Type
 
     if os(windows)
           exposed-modules: Streamly.Internal.FileSystem.Event.Windows
diff --git a/test/Streamly/Test/Prelude/Serial.hs b/test/Streamly/Test/Prelude/Serial.hs
index b0c83b0c3..39ef45345 100644
--- a/test/Streamly/Test/Prelude/Serial.hs
+++ b/test/Streamly/Test/Prelude/Serial.hs
@@ -478,7 +478,7 @@ testTakeInterval :: IO Bool
 testTakeInterval = do
     r <-
           S.fold (FL.tee FL.head FL.last)
-        $ S.takeInterval (toRelTime64 takeDropTime)
+        $ S.takeInterval (fromIntegral takeDropTime * 10**(-9))
         $ S.repeatM (threadDelay 1000 >> getTime Monotonic)
     checkTakeDropTime r
 
@@ -487,7 +487,7 @@ testDropInterval = do
     t0 <- getTime Monotonic
     mt1 <-
           S.fold FL.head
-        $ S.dropInterval (toRelTime64 takeDropTime)
+        $ S.dropInterval (fromIntegral takeDropTime * 10**(-9))
         $ S.repeatM (threadDelay 1000 >> getTime Monotonic)
     checkTakeDropTime (Just t0, mt1)
 #endif
diff --git a/test/streamly-tests.cabal b/test/streamly-tests.cabal
index 4e1995342..98c7e2763 100644
--- a/test/streamly-tests.cabal
+++ b/test/streamly-tests.cabal
@@ -216,13 +216,14 @@ common always-optimized
 -- Test suites in sorted order
 -------------------------------------------------------------------------------
 
-test-suite Data.List
-  import: test-options
-  type: exitcode-stdio-1.0
-  main-is: Streamly/Test/Data/List.hs
-  cpp-options:  -DUSE_STREAMLY_LIST
-  if !flag(dev)
-    buildable: False
+-- The Streamly.Data.List needs to be fixed to enable this
+-- test-suite Data.List
+--   import: test-options
+--   type: exitcode-stdio-1.0
+--   main-is: Streamly/Test/Data/List.hs
+--   cpp-options:  -DUSE_STREAMLY_LIST
+--   if !flag(dev)
+--     buildable: False
 
 test-suite Data.List.Base
   import: test-options