diff --git a/Data/Vector/Generic.hs b/Data/Vector/Generic.hs
--- a/Data/Vector/Generic.hs
+++ b/Data/Vector/Generic.hs
@@ -159,9 +159,11 @@
   where
     n = length v
 
+    -- NOTE: the False case comes first in Core so making it the recursive one
+    -- makes the code easier to read
     {-# INLINE get #-}
-    get i | i < n     = case unsafeIndexM v i of Box x -> Just (x, i+1)
-          | otherwise = Nothing
+    get i | i >= n    = Nothing
+          | otherwise = case unsafeIndexM v i of Box x -> Just (x, i+1)
 
 -- | Create a vector from a 'Stream'
 unstream :: Vector v a => Stream a -> v a
diff --git a/vector.cabal b/vector.cabal
--- a/vector.cabal
+++ b/vector.cabal
@@ -1,5 +1,5 @@
 Name:           vector
-Version:        0.4
+Version:        0.4.1
 License:        BSD3
 License-File:   LICENSE
 Author:         Roman Leshchinskiy <rl@cse.unsw.edu.au>
@@ -42,7 +42,7 @@
   Description: Enable assertions that check parameters to functions are reasonable.
                These will impose a moderate performance cost on users of the library,
                with the benefit that you get reasonable errors rather than segmentation faults!
-  Default:     False
+  Default:     True
 
 Library
   Extensions: CPP