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Implement mechanism for finding prop_info for property slot
Currently there is no efficient way of finding the property_info which corresponds to a given property slot. This patch implements such a mechanism, by storing an array of property_infos in offset order on the class. This structure is lazily initialized when it is needed, though we could also compute it during inheritance. This patch only uses it to optimize visibility checks during foreach (and get_object_vars etc). We avoid having to look up the property by name and can directly check the accessibility. We're also interested in having this mapping to handle some edge cases in the typed properties implementation.
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