in reply to Re^6: [XS] sv_setpv change in behaviour with perl-5.42.0 and later
in thread [XS] sv_setpv change in behaviour with perl-5.42.0 and later

Yeah, you don't need XS. As I explained, the change was to make "x" x 65 behave the same as "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", and you never used XS for the "x" x 65 part.