conv
This crate provides a number of conversion traits with more specific semantics than those provided by as or From/Into.
The goal with the traits provided here is to be more specific about what generic code can rely on, as well as provide reasonably self-describing alternatives to the standard From/Into traits. For example, the although T: From<U> might be satisfied in generic code, this says nothing about what kind of conversion that represents.
In addition, From/Into provide no facility for a conversion failing, meaning that implementations may need to choose between conversions that may not be valid, or panicking; neither option is appealing in general.