[ruby-core:97072] [Ruby master Bug#14909] Method call with object that has to_hash method crashes (method with splat and keyword arguments)

Issue #14909 has been updated by AlexWayfer (Alexander Popov).


There are problems with Sequel Models, which have `#to_hash` method (implicit conversion), and Memery gem, which defines methods with `*args, **kwargs, &block` (`**kwargs` was added after warning from Ruby 2.7).

So, Sequel Models as arguments for memoized methods becomes Hashes and it breaks everything.

The `**(;{})` approach is:

* unclear for me (what it does in Ruby?);
* additional changes at every call;
* offenses RuboCop (should be resolved there, yes).

I'll try to make dynamic methods definition in Memery with exactly expected parameters instead of `*args, **kwargs, &block`, but it's harder.

----------------------------------------
Bug #14909: Method call with object that has to_hash method crashes (method with splat and keyword arguments)
https://bugs.ruby-lang.org/issues/14909#change-84178

* Author: johannes_luedke (Johannes Lke)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin17]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
In a method with a splat method argument followed by a keyword argument, it leads to an `ArgumentError` when calling the method with an object that reacts to `to_hash`


~~~ruby
def my_func(*objects, error_code: 400)
  objects.inspect
end

class Test
  def to_hash
    # an example hash
    { to_hash_key: "to_hash" }
  end
end

my_func(Test.new)
~~~

Observed result: an exception is raised: `in my_func: unknown keyword: to_hash_key (ArgumentError)` 
Expected result: `[#<Test:0x007fc8c9825318>]` is returned by the `my_func` call

It should behave the same when calling with objects that have a `to_hash` method and objects that don't, shouldn't it?



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