If there's no set magic attached, SvSETMAGIC(sv) does nothing. If there is, SvSETMAGIC(sv) makes it work. Knowing you and having just seen how you plan to use this, I know you'll simply assume there's no magic attached to the scalar.

In reply to Re^5: XS: returning a 64-bit unsigned int? by ikegami
in thread XS: returning a 64-bit unsigned int? by BrowserUk

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