A method metaobject contains information about a specific method.
The qualifiers are available as a list of of non-null atoms.
The lambda list is available as a list.
The specializers are available as a list of specializer metaobjects.
When the method is associated with a generic function, that generic function metaobject is available. A method can be associated with at most one generic function at a time.
The documentation is available as a string or nil.