question about dynahash

Hi,
I have a question about dynahash.c.

PG dynahash search, with the increase in the number of elements inserted, the value of high_maskwill be more greater. The calculation method of bucket is hashvalue & high_mask, hashvalue for the same key, each calculated value is the same, but the value of high_mask is changed. So if I need find an element I insert before,the bucket value is not same with the before one. If hash high_mask has adjustment, how to find the elements before? Mask after the change, the calculated bucket value is not a value before, it should not to be able to find.

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