[ruby-core:101201] [Ruby master Bug#16697] Hash.ruby2_keywords_hash?(value) should support any object

Issue #16697 has been updated by Eregon (Benoit Daloze).


I think we need to decide if this change is accepted, I'll add it to the dev meeting agenda.

Indeed, the concrete change would just be that, feel free to give it a try.

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Bug #16697: Hash.ruby2_keywords_hash?(value) should support any object
https://bugs.ruby-lang.org/issues/16697#change-88884

* Author: Eregon (Benoit Daloze)
* Status: Open
* Priority: Normal
* Target version: 3.0
* ruby -v: ruby 2.8.0dev (2020-02-28T14:32:56Z master f7be85a2b7) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
But currently it raises, which makes it needlessly inconvenient to use:
```ruby
> Hash.ruby2_keywords_hash?({})
=> false
> Hash.ruby2_keywords_hash?("hello")
Traceback (most recent call last):
        5: from /home/eregon/.rubies/ruby-trunk/bin/irb:23:in `<main>'
        4: from /home/eregon/.rubies/ruby-trunk/bin/irb:23:in `load'
        3: from /home/eregon/prefix/ruby-trunk/lib/ruby/gems/2.8.0/gems/irb-1.2.3/exe/irb:11:in `<top (required)>'
        2: from (irb):4
        1: from (irb):4:in `ruby2_keywords_hash?'
TypeError (wrong argument type String (expected Hash))
```

See https://github.com/ruby/ruby/pull/2966/files#r394741112 for a motivating example.

I'd like to suggest backporting this to 2.7 too.



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