closure-compiler: Numbers 2^31 < x < 2^31-1 should not raise BITWISE_OPERAND_OUT_OF_RANGE

Take this input:

function toUint32(x) {
  if (x < 0) {
    x += 0x100000000;  // 2^32
  }
  return x;
}

console.log(toUint32(~~0xe0000000).toString(16));

Closure Compiler returns the error:

hello.js:12: WARNING - Operand out of range, bitwise operation will lose information: NUMBER 3.758096384E9 12 [source_file: hello.js]
console.log(toUint32(~~0xe0000000).toString(16));

And yet the output of this code is e0000000, which illustrates that no information is in fact lost.

I think this warning should only fire for numbers > 2^32 - 1, not > 2^31 - 1.