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As can be seen in the code there's a handful of places where this structure needs to be iterated, something that becomes cumbersome when dealing with `Object`s. Hence, by changing this to a `Map` instead we can both simplify the code and avoid creating unnecessary closures. Particularily the `PDFPageProxy._tryCleanup` method becomes a lot more readable, at least in my opinion. Finally, since this property is intended to be "private" the name is adjusted to reflect that.