Hello, I think extenders should have access to at least some of the flags in PObj_enum. Should we have a different function for each flag (say: Parrot_PObj_set_custom_mark(INTERP, PMC, value), Parrot_PObj_set_is_class(INTERP, PMC, value) or a single Parrot_PObj_set_flag(INTERP, PMC, flag, value) where flag is an enumerated value declared in extend.h, NOT the values of PObj_enum.
Extenders also need Parrot_PObj_mark(INTERP, PMC). Comments? Mattia
