Bun.sleep() rounds incorrectly

[argosphil]

What version of Bun is running?

1.0.26+c75e768a6

What platform is your computer?

Linux 6.1.31-gentoo-dist x86_64 13th Gen Intel(R) Core(TM) i7-1370P

What steps can reproduce the bug?

Run this code (based on a test from setTimeout.test.js):

while (true) {
    let ten_ms = new Date();
    ten_ms.setMilliseconds(ten_ms.getMilliseconds() + 12);
    await Bun.sleep(ten_ms);
    let now = new Date();
    if (!(+ten_ms <= +now)) {
	console.error({ten_ms: +ten_ms, now: +now});
	break;
    }
}

What is the expected behavior?

An infinite loop.

What do you see instead?

A break, since eventually Bun.sleep() will return a millisecond before the specified instant has been reached.

Additional information

The fix is simply adding:

    millisecondsValue = JSC::jsNumber(ceil(millisecondsValue.asNumber()));

in BunObject.cpp:functionBunSleep. This will also make Bun.sleep(.001) sleep for a millisecond, which seems like safe behavior.

See #8833.