Issue #17403 has been reported by nobu (Nobuyoshi Nakada).

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Bug #17403: Remove Fixnum and Bignum
https://bugs.ruby-lang.org/issues/17403

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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They are warned as deprecated since 2.4.
As deprecated warnings are not shown by default since 2.7.2, I think we should clean up longstanding warnings.

https://github.com/ruby/ruby/pull/3927



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