I'd add some debugging checks in overload_add_eq to see what state the SVs are in when they arrive in it. Also, as a matter of good practice, I would keep all the SV-mangling stuff in the XS function, and just pass to your C function the mpz_t (or a pointer) values. If that meant the C functions you've shown here go away, then so be it.

In reply to Re^6: Puzzled by value of $overload::ops{binary} by etj
in thread Puzzled by value of $overload::ops{binary} by syphilis

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