Constant DUMP_VERSION 

pub const DUMP_VERSION: u16 = 5; // 5u16

Available on crate features code and embedded-python only.

Version of the dump’s postcard schema.

Bump this whenever a serialized discriminant can shift, so older dumps are rejected instead of decoding as their neighbour. That covers the interpreter’s own types and everything reachable from Dump — notably TypeCheckingConfig in monty-types.