戻る

object_idの仕様は2.xのどこかで変わったらしい（なんで曖昧なんだよ）

> In the old
* days this function was a purely arithmetic operation that maps the
* underlying memory address where the object resides into a Ruby's integer.
* Some time around 2.x this changed.

https://github.com/ruby/ruby/blob/950c60623b83fb778df6b928ccbe46b2e54b18b6/include/ruby/internal/intern/object.h#L228-L234