docs: def from_callable_parameter(cls, parameter):
          """
          Produces a parameter from a function or method
          """
          if parameter.kind == parameter.KEYWORD_ONLY or \
                  parameter.kind == parameter.POSITIONAL_OR_KEYWORD and parameter.default is not parameter.empty:
              if parameter.annotation is not parameter.empty:
                  constraint = parameter.annotation
              else:
                  constraint = Parameter.constraint_from_type(parameter.default)
              return cls(
                  name=parameter.name,
                  value=parameter.default,
                  constraint=constraint,
              )
          else:
              raise ParameterError('Only keyword parameters are supported')