methods
(methods multifn)
Answers the multimethod's method table as a map from dispatch value to method lambda. The map is
a copy: a later defmethod or remove-method does not reach it. The nil row is keyed by nil,
and the Object and default rows are in it. A host class's row is under the keyword class
answers for the class (the oracle keys it by the Class itself). The argument is the
multimethod's name, like get-method's.