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extracted from https://github.com/neondatabase/neon/pull/7468, part of https://github.com/neondatabase/neon/issues/7462. In the page server, we use i128 (instead of u128) to do the integer representation of the key, which indicates that the highest bit of the key should not be 1. This constraints our keyspace to <= 0x7F. Also fix the bug of `to_i128` that dropped the highest 4b. Now we keep 3b of them, dropping the sign bit. And on that, we shrink the metadata keyspace to 0x60-0x7F for now, and once we add support for u128, we can have a larger metadata keyspace. --------- Signed-off-by: Alex Chi Z <chi@neon.tech>