@karolherbst I think you'd probably be better off with something more focused. serde tries to support both human-readable formats like JSON and efficient binary formats, but the code that it generates for the latter is sometimes not as efficient as it could be, particularly for enums.
When you say "And we have some helpers in mesa dealing with reading/writing data to a blob", do you mean you already have helpers for that in Rust, or only in C so far?