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The idea is that frequently accessed properties, e.g. window.document, can be cached directly as data properties on the underlying v8::Object, removing the need for the access call into Zig. This is only used on a handful of properties, almost all of which are on the Window. It is important that the property be read-only. For example, window.location cannot be cached this way because window.location is writable (e.g. window.location.hash = '#blah'). This existed briefly before Zigdom, but was removed as part of the migration. The implementation has changed. This previously relied on a "postAttach" feature which no longer exists. It is not integrated in the bridge/callback directly and lazily applied after the first access.