These work and are correct:

PRINT(Point(180-g._error,180-g._error).hash(&g).toString());
PRINT(Point(-180+g._error,-180+g._error).hash(&g).toString());

Works but incorrect ("00000...')
PRINT(Point(180,180).hash(&g).toString());

Asserts:
PRINT(Point(-180,-180).hash(&g).toString());