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Simon Feltman authored
Support default value of NULL for tail end arguments which are marked with allow-none. The implementation uses a place holder object for un-supplied arguments which are annotated with allow-none. This is then used later during marshaling to supply NULL as the default. Additionally support an implicit default for callback user_data using the same technique. https://bugzilla.gnome.org/show_bug.cgi?id=640812
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