=for apidoc Am|char *|SvPVCLEAR|SV* sv
Ensures that sv is a SVt_PV and that its SvCUR is 0, and that it is
properly null terminated. Equivalent to sv_setpvs(""), but more efficient.
=for apidoc Am|char *|SvPVCLEAR|SV* sv
Ensures that sv is a SVt_PV and that its SvCUR is 0, and that it is
properly null terminated. Equivalent to sv_setpvs(""), but more efficient.