Subclasses don't recognize properly when attribute described as Types::Array.of(Parent)

[k0va1]

Describe the bug

When you try to pass subsclasses of parent class to attribute, dry-struct doesn't parse them as subsclases.

To Reproduce

Here is a code sample:

require 'dry/struct'
module Types
  include Dry.Types()
end

Filter = Class.new(Dry::Struct) do
  attribute :filter_type, Types::String
end

PriceFilter = Class.new(Filter) do
  attribute :min_price, Types::String
  attribute :max_price, Types::String
  attribute :tick_size, Types::String
end

MaxPositionFIlter = Class.new(Filter) do
  attribute :max_position, Types::String
end

Response = Class.new(Dry::Struct) do
  attribute :filters, Types::Array.of(Filter)
end

Response.new(filters: [{filter_type: 'foo', min_price: '1', max_price: '2', tick_size: '3'}, {filter_type: 'bar', max_position: '4'}])
# current behavior: array of FIlter types
=> #<Response filters=[#<Filter filter_type="foo">, #<Filter filter_type="bar">]>

Response = Class.new(Dry::Struct) do
  attribute :filters, Types::Array.of(PriceFilter | MaxPositionFIlter)
end

Response.new(filters: [{filter_type: 'foo', min_price: '1', max_price: '2', tick_size: '3'}, {filter_type: 'bar', max_position: '4'}])
# expected behavior: array of subclasses types
=> #<Response filters=[#<PriceFilter filter_type="foo" min_price="1" max_price="2" tick_size="3">, #<MaxPositionFIlter filter_type="bar" max_position="4">]>

My environment

• Affects my production application: NO
• Ruby version: 2.7.0p0
• OS: Linux