perf: Remove unneeded cmp in Ceil and marshalTo

[ValarDragon]

Description

Pretty slight performance speedup to Dec, by removing an unneeded Cmp against 0, with just using Sign.

This isn't that big of a systemic impact, but noticed it while I was looking at some code so thought I'd make a driveby PR.

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[julienrbrt]

Removing the backport labels as the changes are in math. We probably should test and release math soon.