[ruby-core:76429] [Ruby trunk Feature#12515][Rejected] Create "Boolean" superclass of TrueClass / FalseClass

Issue #12515 has been updated by Yukihiro Matsumoto.

Status changed from Open to Rejected

Rejected for several reasons:

* many gems and libraries had already introduced Boolean class. I don't want to break them.
* `true` and `false` are the only representative of true-false values. In Ruby. `nil` and `false` are falsy values, and everything else is a true value. There's no meaning for having a superclass of `TrueClass` and `FalseClass` as `Boolean`.

Matz.


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Feature #12515: Create "Boolean" superclass of TrueClass / FalseClass
https://bugs.ruby-lang.org/issues/12515#change-59674

* Author: Loren Segal
* Status: Rejected
* Priority: Normal
* Assignee: 
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Since Ruby 2.4 is unifying Bignum/Fixnum into Integer (https://bugs.ruby-lang.org/issues/12005), it seems reasonable to do something similar for TrueClass / FalseClass, and create a proper Boolean hierarchy. The implementation would be fairly straightforward and should be back compat unless someone already has a "Boolean" class at toplevel out there.

Given the compatibility implications of Integer, this Boolean proposal is even less intrusive.

Sample implementation:

~~~
class Boolean < BasicObject; end
class TrueClass < Boolean; end
class FalseClass < Boolean; end
~~~




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