Ghost element when applying multiples minus operations on a PersistentHashSet #219
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If after removing elements from one collision there is one element left, it should be promoted up recursively, but because the
realBitMap == bitmapcheck is above therealSize == 1 && shift != 0check (and the first check always passes if the removal does not happen at this step of the recursion), the promotion only happens 1 level up. I swapped these checks, now everything works correctly. Also, I've added a simpler test that reproduces this issue.