The rkyv crate has stable in-memory representations for many types in the Rust standard library: https://rkyv.org/ https://rkyv.org/ I feel like it is the miss

The rkyv crate has stable in-memory representations for many types in the Rust standard library: https://rkyv.org/ https://rkyv.org/ I feel like it is the missing piece here because you could do hash table lookups in shared memory, too!