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67a0f3e914
There are notably 4 classes of GTypes where a girepository lookup might fail: - GTypes from private interfaces in public objects (eg. MetaCullable in mutter) - GTypes for private base objects with public interfaces (eg. GLocalFile in GLib) - GTypes registered from the language, and presumably not coming from the GIR - GTypes of objects/interfaces that we didn't load a typelib for It is moot to look for those over and over again, and a full lookup can be taxing if looking up for a method/property on objects with those characteristics. It seems we can cache the misses too, so next lookups are just as quick as an introspected GType. The cache is invalidated after loading new typelibs, in case some of the previously missed GTypes is now properly introspected.