merged in evilpie's fix for faster small range comprehensions

src/nodes.coffee

@@ -578,8 +578,13 @@ exports.RangeNode = class RangeNode extends BaseNode
     i      = o.scope.freeVariable()
     pre    = "\n#{idt}#{result} = []; #{vars}"
     if @fromNum and @toNum
-      o.index = i
-      body = @compileSimple o
+      if Math.abs(+@fromNum - +@toNum) <= 20
+        range = [+@fromNum..+@toNum]
+        range.pop() if @exclusive
+        return "[#{ range.join(', ') }]"
+      else
+        o.index = i
+        body.compileSimple o
     else
       clause = "#@fromVar <= #@toVar ?"
       body   = "var #i = #@fromVar; #clause #i <#@equals #@toVar : #i >#@equals #@toVar; #clause #i += 1 : #i -= 1"