Bryan O'Sullivan avatar Bryan O'Sullivan committed 0e957b2

Handle Infinity and NaN more compatibly.

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 double :: Double -> Builder
 double f
-    | isNaN f || isInfinite f   = fromByteString "null"
+    | isInfinite f              = fromByteString $
+                                  if f > 0 then "Infinity" else "-Infinity"
     | f < 0 || isNegativeZero f = minus `mappend` goGeneric (floatToDigits (-f))
-    | otherwise                 = goGeneric (floatToDigits f)
+    | f >= 0                    = goGeneric (floatToDigits f)
+    | otherwise                 = fromByteString "NaN"
    goGeneric p@(T _ e)
      | e < 0 || e > 7 = goExponent p
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