Hi!
Wouldn't it suffice to add a field for the hash value and a flag that indicates its validity to zval instead of appending zend_literal everywhere?
Enlarging zval would be costly (the engine uses tons of zvals) and may also be more complicated to track (all zval operations now would also have to take care to set the flag right - what if we forget in some extension to set it right?). I think it's better not to mess with zval.
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