Treat -0 as smaller than +0 (#15)

* Treat -0 as smaller than +0

* Fix min > max edge case

Author: Richienb

spec.emu

@@ -23,13 +23,14 @@ contributors: Oliver Medhurst, Richie Bendall
         1. If _min_ is *NaN*, throw a *RangeError* exception.
         1. If _max_ is not a Number, throw a *TypeError* exception.
         1. If _max_ is *NaN*, throw a *RangeError* exception.
+        1. If _min_ is *+0*<sub>𝔽</sub> and _max_ is *-0*<sub>𝔽</sub>, throw a *RangeError* exception.
         1. If _min_ > _max_, throw a *RangeError* exception.
         1. If _value_ is *NaN*, return *NaN*.
-        1. If _value_ is *-0*<sub>𝔽</sub> and _min_ is *+0*<sub>𝔽</sub>, return _min_.
-        1. If _value_ is *+0*<sub>𝔽</sub> and _min_ is *-0*<sub>𝔽</sub>, return _min_.
+        1. If _value_ is *-0*<sub>𝔽</sub> and _min_ is *+0*<sub>𝔽</sub>, return *+0*<sub>𝔽</sub>.
+        1. If _value_ is *+0*<sub>𝔽</sub> and _min_ is *-0*<sub>𝔽</sub>, return *+0*<sub>𝔽</sub>.
         1. If _value_ &lt; _min_, return _min_.
-        1. If _value_ is *-0*<sub>𝔽</sub> and _max_ is *+0*<sub>𝔽</sub>, return _max_.
-        1. If _value_ is *+0*<sub>𝔽</sub> and _max_ is *-0*<sub>𝔽</sub>, return _max_.
+        1. If _value_ is *-0*<sub>𝔽</sub> and _max_ is *+0*<sub>𝔽</sub>, return *-0*<sub>𝔽</sub>.
+        1. If _value_ is *+0*<sub>𝔽</sub> and _max_ is *-0*<sub>𝔽</sub>, return *-0*<sub>𝔽</sub>.
         1. If _value_ > _max_, return _max_.
         1. Return _value_.
 	</emu-alg>