module Grape::Extensions::Hash::ParamBuilder

def build_params
  rack_params.deep_dup.tap do |params|
    params.deep_symbolize_keys!
    if env.key?(Grape::Env::GRAPE_ROUTING_ARGS)
      grape_routing_args.deep_symbolize_keys!
      params.deep_merge!(grape_routing_args)
    end
  end
end