Issue #5523 has been reported by tadayoshi funaba.

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Feature #5523: Numeric#sign ?????
http://redmine.ruby-lang.org/issues/5523

Author: tadayoshi funaba
Status: Open
Priority: Normal
Assignee: 
Category: core
Target version: 2.0


????????????正????Ӧ???????????????????????????????????complex ???
lib/cmath.rb ????中???????????????????????????????????????????????
??????????????????????????????????????

????-1???+1?????????????????????????


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