[perl #45959] [TODO] Check arity (or is that parity) of sub in mmd_maybe_candidate()

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 In the file src/mmd.c there is the todo item within mmd_maybe_candiate():

if (VTABLE_isa(interp, pmc, _sub)) {
    /* a plain sub stops outer searches */
    /* TODO check arity of sub */

    VTABLE_push_pmc(interp, cl, pmc);