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use strict;
use warnings;
...
-123456
255
256

    +v          -v          +v          -v      
          1          -2  0b00000001  0b11111110
...
    -123456      123455  0b11000000  0b00111111
        255        -256  0b11111111  0b00000000
        256        -257  0b00000000  0b11111111