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describe RUBY_INTEGER_UNIFICATION.

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55634 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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akr 2016-07-11 14:08:49 +00:00
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@ -123,6 +123,7 @@ with all sufficient information, see the ChangeLog file or Redmine
So obj.kind_of?(Fixnum) works as obj.kind_of?(Integer).
At C-level, Fixnum object and Bignum object should be distinguished by
FIXNUM_P(obj) and RB_TYPE_P(obj, T_BIGNUM).
RUBY_INTEGER_UNIFICATION can be used to detect this feature.
ruby-2.4.0-preview1 (temporally) removes rb_cFixnum and rb_cBignum
to check the effect of incompatibility.
(rb_cFixnum and rb_cBignum may be defined as rb_cInteger later if