> Can someone speak to what language has the best support for this? I can give you the Rust perspective, but I'm not sure it's the best. > arbitrary file I/O

> Can someone speak to what language has the best support for this? I can give you the Rust perspective, but I'm not sure it's the best. > arbitrary file I/O include_str! and include_bytes! make the contents of a file available as a string or a byte array. More complex types would need a build script (or transmute). > non-fixed-sized containers, ie vector No support in `const fn`, but you can again use a build script as an escape hatch. > a generic memoization utility in the standard library for caching There's nothing in the stdlib, but there are a few third party crates that give you the easy one-line syntax, such as https://crates.io/crates/memoize https://crates.io/crates/memoize