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describe "0.class == Integer" to detect the feature.

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56192 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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akr 2016-09-20 11:12:38 +00:00
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@ -158,7 +158,8 @@ 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_INTEGER_UNIFICATION can be used to detect this feature at C-level.
0.class == Integer can be used to detect this feature at Ruby-level.
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