[ruby-core:107838] [Ruby master Feature#18621] Fiber.yield loses the fact it was kwargs from Fiber#resume

Issue #18621 has been updated by Eregon (Benoit Daloze).


And thank you for this fast and detailed reply :)

----------------------------------------
Feature #18621: Fiber.yield loses the fact it was kwargs from Fiber#resume
https://bugs.ruby-lang.org/issues/18621#change-96768

* Author: Eregon (Benoit Daloze)
* Status: Rejected
* Priority: Normal
----------------------------------------
```ruby
f = Fiber.new do
  args = Fiber.yield
  args
end
f.resume
args = f.resume(a: 1)
Hash.ruby2_keywords_hash?(args) # => false, but should be true, isn't it?
```

This also means if there is `foo(*args)` later and `foo` would require kwargs it would fail:

```ruby
def foo(a: 1) = a

f = Fiber.new do
  args = Fiber.yield
  args
end
f.resume
args = f.resume(a: 1)
foo(*args)
# =>
# -:1:in `foo': wrong number of arguments (given 1, expected 0) (ArgumentError)
# 	from -:9:in `<main>'
```

cc @jeremyevans0 @mame



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