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Mouseaim y-axis wraps if the view is moved fast enough, rather than being bounded  "Probably an over/underflow of some form"

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Starting from some revision between 4696 and 4777 (synthesis builds for revisions inbetween do not exist unfortunately), with mouse aiming on, move the mouse up or down at high velocity.
Rather than stopping at the boundary as it should, the view may "wrap around", meaning that you end up looking in the other vertical direction. If you look up fast enough it will wrap around to looking down and vice-versa.

This becomes more noticeable as you increase the mouse sensitivity. I assume there is some kind of overflow here when computing the deltas, but I haven't been able to pinpoint anything exactly.
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