I don't think it's an oversight; the implementation calls `checked_add` and `checked_mul` explicitly -- https://github.com/rust-lang/rust/blob/1744c46e47434d8c0

I don't think it's an oversight; the implementation calls `checked_add` and `checked_mul` explicitly -- https://github.com/rust-lang/rust/blob/1744c46e47434d8c0b63a839678ce45f1988bb74/src/libcore/iter/traits.rs#L587-L625 https://github.com/rust-lang/rust/blob/1744c46e47434d8c0b63a...