make properly commutative

lib/range_math.rb

@@ -37,7 +37,13 @@ class Range
   end
 
   def coerce(other)
-    return self, other
+    if other.is_a? Range
+      return other, self
+    elsif other.is_a? Numeric
+      return (other..other), self
+    else
+      super
+    end
   end
 
   def pair_or_num operator, other

range_math.gemspec

@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name = "range_math"
-  s.version = "0.4.0"
+  s.version = "0.5.0"
 
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
   s.authors = ["muflax"]