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b68a03b9b6
This new API does the same thing as gi_type_info_extract_ffi_return_value, but takes a GITypeTag instead of GITypeInfo pointer, and additionally a GIInfoType if the GITypeTag is GI_TYPE_TAG_INTERFACE. (These pieces of data are the only things used from the GITypeInfo structure.) It's intended for bindings using an argument cache, such as GJS and PyGObject, so that they don't have to store a whole 64-bit GITypeInfo pointer in their cache in many common cases, and can just store the 5-bit type tag instead, or the 5-bit interface type in case of GI_TYPE_TAG_INTERFACE. The original gi_type_info_extract_ffi_return_value() is reimplemented in terms of the new gi_type_tag_extract_ffi_return_value().