code: def cast_request_param(param_type, param_name, param_value):
      
      try:
          return CAST_TYPE_TO_FUNC.get(param_type, lambda x: x)(param_value)
      except ValueError:
          log.warn("Failed to cast %s value of %s to %s",
                   param_name, param_value, param_type)
          # Ignore type error, let jsonschema validation handle incorrect types
          return param_value
docs: Try to cast a request param (e.g. query arg, POST data) from a string to
      its specified type in the schema. This allows validating non-string params.
  
      :param param_type: name of the type to be casted to
      :type  param_type: string
      :param param_name: param name
      :type  param_name: string
      :param param_value: param value
      :type  param_value: string