Error messages for invalid nested data (via keys inside hash?) are not similarly nested

[timriley]

With a schema like this, with a single rule inside a single level of nesting:

schema = Dry::Validation.Schema do
  key(:meta) do
    hash? do
      key(:pages).required(:int?)
    end
  end
end

When I call it with invalid data, the error messages are not properly nested:

schema.(meta: {pages: "123"}).messages
# => {:meta=>["must be an integer"]}

FWIW, if I set the meta hash without any child keys, the error messages are properly nested:

schema.(meta: {}).messages
# => {:meta=>{:pages=>["is missing"]}}

This only seems to be a problem for keys inside a hash? block. If I use a nested schema instead:

schema = Dry::Validation.Schema do
  key(:meta).schema do
    key(:pages).required(:int?)
  end
end

Then the error messages come back properly:

schema.(meta: {pages: "123"}).messages
# => {:meta=>{:pages=>["must be an integer"]}}