def attr_configurable_str *args, &block
      trans = attr_configurable_wrap lambda { |v| v.to_s }, block
      attr_configurable_single(*args, &trans)
    end
def attr_configurable_str *args, &block
      trans = attr_configurable_wrap lambda { |v| v.to_s }, block
      attr_configurable_single(*args, &trans)
    end
Creates a group readable and writeable attributes that can be set
 by a URI query parameter sharing the same name, a property of a URI or
 a default value. The value of this attribute will be transformed by
 invoking the given block, if one has been provided. The attributes
 created by this method will be treated as though they were created
 with {#attr_configurable_single} and will also be converted into Strings.