fix: clamp Extend size hint so HeaderMap reserve cannot overflow#833
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Extendimpls pass the iterator's size hint straight toreserve, but that hint can exceed the number of names the table is able to index (e.g. when the iterator yields many appended values for one name), causing aMaxSizeReachedpanic for input that the map can actually hold. This clamps the reservation to the largest valuereservewill accept.Closes #604