// through the oldbucket, skipping any keys that will go
			// to the other new bucket (each oldbucket expands to two
			// buckets during a grow).
			if t.ReflexiveKey() || t.Key.Equal(k, k) {
				// If the item in the oldbucket is not destined for
				// the current new bucket in the iteration, skip it.
				hash := t.Hasher(k, uintptr(h.hash0))

	return mt.Flags&1 != 0
}
func (mt *MapType) IndirectElem() bool { // store ptr to elem instead of elem itself
	return mt.Flags&2 != 0
}
func (mt *MapType) ReflexiveKey() bool { // true if k==k for all keys
	return mt.Flags&4 != 0
}
func (mt *MapType) NeedKeyUpdate() bool { // true if we need to update key on an overwrite
	return mt.Flags&8 != 0
}