Expand description
This is a polyfill for a small subset of std’s strict provenance APIs.
The strict provenance APIs in core were stabilized in Rust 1.84,
but it will likely be a while before Jiff can use them. (At time of
writing, 2025-02-24, Jiff’s MSRV is Rust 1.70.)
The const requirement is also why these are non-generic free
functions and not defined via an extension trait. It’s also why we
don’t have the useful map_addr routine (which is directly relevant to
our pointer tagging use case).