[ruby-core:98119] [Ruby master Bug#16826] ObjectSpace::WeakMap#key? returns false if value is nil

Issue #16826 has been updated by Eregon (Benoit Daloze).

Assignee set to Eregon (Benoit Daloze)

I'll fix this.

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Bug #16826: ObjectSpace::WeakMap#key? returns false if value is nil
https://bugs.ruby-lang.org/issues/16826#change-85360

* Author: Eregon (Benoit Daloze)
* Status: Open
* Priority: Normal
* Assignee: Eregon (Benoit Daloze)
* ruby -v: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux]
* Backport: 2.5: DONTNEED, 2.6: DONTNEED, 2.7: REQUIRED
----------------------------------------
```
$ ruby -e 'map=ObjectSpace::WeakMap.new; map[:foo] = 4; p map; p map.key? :foo'  
#<ObjectSpace::WeakMap:0x000055fbe0c38c00: :foo => 4>
true # OK

$ ruby -e 'map=ObjectSpace::WeakMap.new; map[:foo] = nil; p map; p map.key? :foo'
#<ObjectSpace::WeakMap:0x000056371e3f86e8: :foo => nil>
false # BUG
```



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