* sv and mg are the tied thinggy and the tie magic;
* meth is the name of the method to call;
-* argc, arg1, arg2 are the number of args (in addition to $self) to pass to
- the method, and the args themselves
+* argc is the number of args (in addition to $self) to pass to the method;
+ the args themselves are any values following the argc argument.
* flags:
G_DISCARD: invoke method with G_DISCARD flag and don't return a value
- G_UNDEF_FILL: fill the stack with argc pointers to PL_sv_undef;
- ignore arg1 and arg2.
+ G_UNDEF_FILL: fill the stack with argc pointers to PL_sv_undef.
Returns the SV (if any) returned by the method, or NULL on failure.