Clamp to MAX / INFINITY rather than panic on overflow in number parsing

[SimonSapin]

r? @jdm

This also changes the numeric types in tokens from f64 / i64 to f32 / i32, which might requires some changes in Servo.

[jdm]

This comment is confusing.

[SimonSapin]

The change made it wrong, and I forgot to update it. Fixed in a follow-up commit.

[jdm]

} else {

[SimonSapin]

Done

[jdm]

I haven't looked at the merge commit; the rest look fine to me. Should I be looking at the merge?

[SimonSapin]

The merge includes some fairly simple conflict resolutions, as well as a replacement of Float::powf with f64::powf (corresponding to a Rust upgrade).

By the way, the commit to use in Servo (unless Servo does another Rust upgrade) is the one before the merge.

[jdm]

I don't think there's a burning need to adopt these changes before the next upgrade. Looks good to me!

[SimonSapin]

Looks good to me!

I’ll take that as r+ :)