diff --git a/Data/Number/LogFloat.hs b/Data/Number/LogFloat.hs
--- a/Data/Number/LogFloat.hs
+++ b/Data/Number/LogFloat.hs
@@ -14,7 +14,7 @@
 
 -- {-# OPTIONS_GHC -ddump-rules -ddump-simpl-stats #-}
 
-{-# OPTIONS_GHC -Wall -fwarn-tabs -Werror #-}
+{-# OPTIONS_GHC -Wall -fwarn-tabs #-}
 
 -- Unfortunately we need -fglasgow-exts in order to actually pick
 -- up on the rules (see -ddump-rules). The -frewrite-rules flag
@@ -24,6 +24,7 @@
 {-# OPTIONS_GHC -O2 -fvia-C -optc-O3 -fexcess-precision -fglasgow-exts #-}
 
 -- Version History
+-- (v0.9.1) Fixed some PartialOrd stuff and sanitized documentation
 -- (v0.9.0) s/toFractional/realToFrac/g.
 --          Also moved realToFrac and log to Transfinite
 -- (v0.8.6) Removed buggy RULES
@@ -132,8 +133,8 @@
 -- | Reduce the number of constant string literals we need to store.
 
 errorOutOfRange    :: String -> a
-errorOutOfRange fun = error $ "Data.Number.LogFloat."++fun
-                           ++ ": argument out of range"
+errorOutOfRange fun = error $! "Data.Number.LogFloat."++fun
+                            ++ ": argument out of range"
 
 
 -- | We need these guards in order to ensure some invariants.
@@ -186,7 +187,7 @@
 instance PartialOrd LogFloat where
     cmp (LogFloat x) (LogFloat y) 
         | isNaN x || isNaN y = Nothing
-        | otherwise          = Just (x `compare` y)
+        | otherwise          = Just $! x `compare` y
 
 
 -- | A constructor which does semantic conversion from normal-domain
diff --git a/Data/Number/PartialOrd.hs b/Data/Number/PartialOrd.hs
--- a/Data/Number/PartialOrd.hs
+++ b/Data/Number/PartialOrd.hs
@@ -3,7 +3,7 @@
            , UndecidableInstances
            #-}
 
-{-# OPTIONS_GHC -Wall -fwarn-tabs -Werror #-}
+{-# OPTIONS_GHC -Wall -fwarn-tabs #-}
 
 ----------------------------------------------------------------
 --                                                  ~ 2008.08.29
@@ -74,22 +74,22 @@
 infix 4 `gt`, `ge`, `eq`, `ne`, `le`, `lt`
 
 instance (Ord a) => PartialOrd a where
-    cmp x y = Just (compare x y)
-    gt  x y = Just (x >  y)
-    ge  x y = Just (x >= y)
-    eq  x y = Just (x == y)
-    ne  x y = Just (x /= y)
-    le  x y = Just (x <= y)
-    lt  x y = Just (x <  y)
+    cmp x y = Just $! compare x y
+    gt  x y = Just $! x >  y
+    ge  x y = Just $! x >= y
+    eq  x y = Just $! x == y
+    ne  x y = Just $! x /= y
+    le  x y = Just $! x <= y
+    lt  x y = Just $! x <  y
 
 -- The instances inherited from Ord are wrong
 instance PartialOrd Float where
     cmp x y | isNaN x || isNaN y = Nothing
-            | otherwise          = Just (x `compare` y)
+            | otherwise          = Just $! x `compare` y
 
 instance PartialOrd Double where
     cmp x y | isNaN x || isNaN y = Nothing
-            | otherwise          = Just (x `compare` y)
+            | otherwise          = Just $! x `compare` y
 
 ----------------------------------------------------------------
 ----------------------------------------------------------- fin.
diff --git a/Data/Number/Transfinite.hs b/Data/Number/Transfinite.hs
--- a/Data/Number/Transfinite.hs
+++ b/Data/Number/Transfinite.hs
@@ -7,7 +7,7 @@
 -- Glasgow extensions needed to enable the # kind
 {-# OPTIONS_GHC -cpp -fglasgow-exts #-}
 
-{-# OPTIONS_GHC -Wall -fwarn-tabs -Werror #-}
+{-# OPTIONS_GHC -Wall -fwarn-tabs #-}
 
 ----------------------------------------------------------------
 --                                                  ~ 2008.08.29
diff --git a/logfloat.cabal b/logfloat.cabal
--- a/logfloat.cabal
+++ b/logfloat.cabal
@@ -1,9 +1,9 @@
 ----------------------------------------------------------------
--- wren ng thornton <wren@community.haskell.org>    ~ 2008.08.29
+-- wren ng thornton <wren@community.haskell.org>    ~ 2008.10.12
 ----------------------------------------------------------------
 
 Name:           logfloat
-Version:        0.9.1
+Version:        0.9.1.1
 Cabal-Version:  >= 1.2
 Build-Type:     Simple
 Stability:      provisional
@@ -21,11 +21,23 @@
                 probabilities as is done in Hidden Markov Models.
                 It is also helpful for preventing overflow.
 
+-- Doing it this way uncovers a bug in Cabal-1.2.3.0:
+-- "Setup.hs: 'parseField' called on a non-field.  This is a bug."
+--Flag hiddenPrim
+--    Description: Use GHC 6.10's newly hidden package for GHC.Prim
+--    if impl(ghc >= 6.10)
+--        Default: true
+--    else
+--        Default: false
+
 Library
     Exposed-Modules: Data.Number.LogFloat
                    , Data.Number.Transfinite
                    , Data.Number.PartialOrd
     Build-Depends:   base
+--    if flag(hiddenPrim)
+    if impl(ghc >= 6.10)
+        Build-Depends: ghc-prim
 
 ----------------------------------------------------------------
 ----------------------------------------------------------- fin.