Merge pull request #162 from erisco/eric/boundednum

ADD: Bounded Number instance.

Author: garyb

src/Data/Bounded.js

@@ -5,3 +5,6 @@ exports.bottomInt = -2147483648;
 
 exports.topChar = String.fromCharCode(65535);
 exports.bottomChar = String.fromCharCode(0);
+
+exports.topNumber = Number.POSITIVE_INFINITY;
+exports.bottomNumber = Number.NEGATIVE_INFINITY;

src/Data/Bounded.purs

@@ -44,3 +44,10 @@ instance boundedOrdering :: Bounded Ordering where
 instance boundedUnit :: Bounded Unit where
   top = unit
   bottom = unit
+
+foreign import topNumber :: Number
+foreign import bottomNumber :: Number
+
+instance boundedNumber :: Bounded Number where
+  top = topNumber
+  bottom = bottomNumber