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Feature #12005

Updated by naruse (Yui NARUSE) over 1 year ago

CRuby has two `Integer` classes, `Fixnum` and `Bignum`.
But it is implementation detail.
They should be seen as a single class `Integer` like `Flonum`.

## Compatibility note

* Q: How do I check whether Fixnum and Bignum are unified or not?
* A: check RUBY_INTEGER_UNIFICATION macro

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