Script:

print(Math.abs(java.lang.Integer.MIN_VALUE))
print(Math.abs(-2147483648))

Expected output:

2147483648
2147483648

Output seen with optimistic types enabled (default mode)

-2147483648
2147483648

Output seen with optimistic types disabled (same as expected output)

$ jjs -ot=false t.js
2147483648
2147483648