from_int(-2147483648) = <> from_int(-128) = <> from_int(-1) = <> from_int(0) = 0 from_int(1) = 1 from_int(2) = 2 from_int(8) = 8 from_int(10) = 10 from_int(16) = 16 from_int(127) = 127 from_int(255) = 255 from_int(256) = <> from_int(2147483647) = <>