Daniel Bertalan 96b197ef46 LibJS/Temporal: Perform floating point arithmetic in RoundTime ...

The valid range for temporal values (`nsMinInstant`/`nsMaxInstant`)
means performing nanosecond-valued integers could lead to an overflow.

NB: Only the `roundingMode: "day"` case was affected, as all others were
already performing the division on floating-point `fractional_second`
values. I'm adding `.0` suffixes everywhere to make this fact clearer.

This adds a few local tests as well, as those are tested with sanitizers
enabled by default, unlike test262.

2023-07-01 06:51:25 +02:00

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