TreeModel HAS_CHILD return

When implementing HAS_CHILD for a TreeModel, I tried to return a string
or undef as my boolean but got an error,

    Argument "\x{5e}\x{41}..." isn't numeric in subroutine entry at line 18.

gtk2perl_tree_model_iter_has_child looks like it uses POPi.  Could it
test the return with sv_true (or whichever test it is that correctly
handles magic)?

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