Apply nested schema to all values of a hash

Support dry-validation
4

There’s no standard solution for merging errors automatically, you’ll need to do it manually in the way that works for you. For example, I have code like this in one place

rule(:some_collection).each do
  case validate_element.(value) # some other contract injected above
  in Success then nil
  in Failure(errors)
    errors.each do |path, messages|
      key([:some_collection, *path]).failure(message)
    end
  end
end