Function type_expr 

pub fn type_expr<T: 'static>() -> TypeExpr

Returns the best-effort TypeExpr for a Rust type T.

Resolution order:

1. register_type::<T>(...)
2. Built-in primitives and common shims (e.g. Vec<u8> as Bytes)
3. Opaque("rust:<type_name>") fallback

use daedalus_data::typing::type_expr;
let ty = type_expr::<String>();
assert!(format!("{ty:?}").contains("String"));