[ruby-core:97207] [Ruby master Bug#16643] Array#dig converts keywords to positional hash

Issue #16643 has been reported by Dan0042 (Daniel DeLorme).

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Bug #16643: Array#dig converts keywords to positional hash
https://bugs.ruby-lang.org/issues/16643

* Author: Dan0042 (Daniel DeLorme)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.0p0 (2019-12-25 revision a65e8644fb) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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The following behavior for `dig` looks very weird to me:

```ruby
o=Object.new
def o.dig(**kw) p [kw] end
o.dig(x:1)     
#no warning
#[{:x=>1}]
[o].dig(0, x:1)
#warning: Using the last argument as keyword parameters is deprecated
#[{:x=>1}]

o=Object.new
def o.dig(a, **kw) p [a,kw] end
o.dig(x:1)
#warning: Passing the keyword argument as the last hash parameter is deprecated
#[{:x=>1}, {}]
[o].dig(0, x:1)
#no warning
#[{:x=>1}, {}]
```

So the keywords are interpreted as a positional hash, resulting in the opposite of the behavior I would expect.

This would be easy to fix by changing `rb_obj_dig` to use 

```
        return rb_check_funcall_with_hook_kw(obj, id_dig, argc, argv,
                                             no_dig_method, obj,
                                             RB_PASS_CALLED_KEYWORDS);
```

What this just an oversight? I can't think of a rationale for the current behavior.




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