core: Fix undefined wrapping behavior triggered by Rust nightly (fix #579) #582
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Casting floats-to-int could be treacherous in Rust, and it is currently undefined behavior on stable if the value wasn't representable in the target type. A PR just landed in nightly that defines these to saturate. This broke a few things in our code that were incorrectly relying on this undefined behavior.
Fix these methods to avoid undefined behavior and properly handle the edge cases. Fixes #579.
See:
https://doc.rust-lang.org/1.22.1/book/first-edition/casting-between-types.html#numeric-casts (old behavior)
rust-lang/rust#71269
rust-lang/rust#10184