Incorrect bit toggle in decode loop

[Imran-imtiaz48]

Location: Inside decode_geohash, this line:

SET @even = ~@even;

~ is a bitwise NOT, not a boolean toggle. Since @even is BIT, ~1 becomes -2 and ~0 becomes -1, so the logic breaks after the first loop. It should toggle between 1 and 0, not invert all bits.