[ruby-core:93945] [Ruby master Bug#16026] `Set#count` performance issues

Issue #16026 has been updated by Hanmac (Hans Mackowiak).


technically `Set#count` comes from `Enumerable`, where it has support for this too

```
enum.count(item)           -> int
enum.count { |obj| block } -> int
```

so i don't think Set should make `#count` work like `#size`

----------------------------------------
Bug #16026: `Set#count` performance issues
https://bugs.ruby-lang.org/issues/16026#change-80131

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
* Assignee: knu (Akinori MUSHA)
* Target version: 
* ruby -v: 
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
`Set#size` is O(1), but `Set#count` is O(N).

I would like to add `alias count size` to `class Set`

Is it okay?



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