Key map contains duplicates on inheritance

[pyromaniac]

Describe the bug

When one schema is inherited from another one and redefines some fields, those fields got duplicated in the schema's key_map.

To Reproduce

class Foo < Dry::Schema::Params
  define do
    required(:foo).filled(:integer)
  end
end

class Bar < Foo
  define do
    required(:foo).filled(:string)
  end
end

Foo.new.key_map
#=> #<Dry::Schema::KeyMap["foo"]>
Bar.new.key_map
#=> #<Dry::Schema::KeyMap["foo", "foo"]>

Expected behavior

I would expect the exact list of schema keys in the keymap.

[pyromaniac]

@solnic, @flash-gordon I can even work on the PR fixing this. I just need to know your opinion, folks. Does it look like a bug to you or an intended behavior?

[flash-gordon]

@pyromaniac 💯 that wasn't planned to work like this :)

[solnic]

This was finally fixed in 1.10.5

[pyromaniac]

Thank you so much!