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Make GLib.Variant.unpack a bit less costly

Mathieu Bridon requested to merge bochecha/gvariant-unpack into master

I'm iterating over a dump of 245000+ serialized GVariants, unpacking each one of them.

Overall, the changes in this merge request make that about 27% faster: it went from roughly 8min30 to roughly 6min10.

I tried profiling it, and it seems to me that to get further savings we would need to rewrite the function entirely in C as a Python extension.

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