Graphql-ruby: Missing type validation for lists

[ChepChaf]

I have a resolver that takes a list of enums as an argument, but when i send something other than that enum ir raises an exception instead of returning an error. e.g:
enum:

class Enums::FooEnum < Enums::BaseObject
  value 'Foo1', value: 'foo1'
  value 'Foo2', value: 'foo2'
end

resolver:

class Resolvers::BarResolver < Resolvers::Base
  argument :foo, [Enums::FooEnum], required: true

  def resolve(**args)
    # do something that raises `CantDoThatException`
   #  unless every element of `foo` is a `FooEnum`
  end
end

query_1:

bar(foo: [Foo1, Foo2]) {
  fields
}

query_2:

bar(foo: [Foo1, 'random_value']) {
  fields
}

query_1 works as expected
query_2 raises CantDoThatException instead of returning something like:

{
  "errors": [
    {
      "message": "Argument 'dimensions' on Field 'images' has an invalid value. Expected type '[FooEnum!]!'.", ...
      ...
    }
  ]
}

Edit: After futher investigation i noticed that

>> args[:foo]
['foo1', nil]

So instead of returning an error it is casting all invalidad arguments to nil

[rmosolgo]

Thanks for the great bug report! It will be fixed in the next release by #2441