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Torsten Schönfeld authored
interface_to_sv will soon start calling back into Perl, so any xsub invoking it (directly or indirectly) needs to save the stack pointer via PUTBACK/SPAGAIN. Currently, arg_to_sv and get_field are the only affected functions that are called from xsubs. We provide macros SS_arg_to_sv and SS_get_field that automatically handle the stack pointer correctly.
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