Improve performance of System::Time.monotonic on Windows

[straight-shoota]

No description provided.

[HertzDevil]

The float division can probably be replaced with an integer one.

Also I would prefer tdiv over // here (or % over remainder) as this way they would have the same sign behavior.

[ysbaddaden]

Damn, tdivmod raises a math overflow.

[straight-shoota]

Are you sure it's tdivmod raising an error? It shouldn't raise on any other conditions than //.

The exception seems to come from the event loop.
And all other windows runners are stalled.

[straight-shoota]

The problem seems to be that the type of the output parameter ticks changes when I assign the return value of tdivmod.
That shouldn't affect the previous typing for the lib call, but apparently it does 🤷

[ysbaddaden]

Nice catch.

Indeed, it wasn't tdivmod raising a math overflow, but System::WaitableTimer#set that does checked mul / add / sub ops on Time::Instant 🙇