I'm trying to work through some of the more subtle changes in phpng and one that sticks out is the loss of IS_BOOL. I think the explanation is that it removes a read, but while I'm only seeing a few uses of is_bool across the codebase, every one of them is used simply to convert the bool value into some other format. Surely what would make more sense here is simply to make the type_flag either true or false, and retain the IS_BOOL as a single identifiable type? Having two types both indicating 'bool' just seems wrong.
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