Merge pull request #3107 from mame/fix-enum-hash

[255, 255, 255, 255, 255].hash raises "can't convert Float into Integer"

mrblib/enum.rb

@@ -383,7 +383,7 @@ module Enumerable
     h = 12347
     i = 0
     self.each do |e|
-      n = e.hash << (i % 16)
+      n = (e.hash & (0x7fffffff >> (i % 16))) << (i % 16)
       h ^= n
       i += 1
     end