Result of the block in the 'given' method are ignored

Hello!

In the Grape 1.0.2 the code below works fine:

params do
  requires :payment_type, type: String, values: ['ccard', 'paypal', 'applepay']
  given payment_type: ->(val) { val == 'applepay' } do
    optional :m_card_holder, type: Hash, as: :card_holder do
      optional :first_name, type: String, allow_blank: false, desc: 'Cardholder first name'
      optional :last_name, type: String, allow_blank: false, desc: 'Cardholder last name'
    end
  end
  given payment_type: ->(val) { !(val === 'applepay') } do
    optional :card_holder, type: String, allow_blank: false
  end
end
post '', root: 'payments' do
  # Payments processing
  # ...
end

When the request were from Apple Pay, the card_holder parameter became Hash and were parsed as Hash,
otherwise it been treated as String. It was fine for a time, but then the Grape were upgraded to 1.5.3,
this behavior became broken. In the version 1.5.3, result of the blocks in the 'given' method are ignored
and 'declared' method resturns all the parameters defined in 'params' without conditions. In the case above, the 'cardholder',
passed from request as string in accordance with payment_type='ccard', parsed by Grape as Hash instead of string,
and causes exception

undefined method `any?' for "NA ME":String

in the line https://github.com/ruby-grape/grape/blob/e83e81fe95d71134f2156aa6f31c22fcf954227f/lib/grape/dsl/inside_route.rb#L61

It is unexpected behaviour and I didn't find any notes about changes in the 'given' methods, it's looks like a bug.

Start with lib/grape/dsl/inside_route.rb at the linked line and reproduce the payment_type example on Grape 1.5.3. Trace how given blocks affect declared parameters, then verify that card_holder keeps the conditional type and no longer raises the reported String/Hash exception.