Function nova_rt_str_to_upper 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn nova_rt_str_to_upper(
    s: *const NovaStr,
) -> *mut NovaStr

Uppercase s with full Unicode case mapping.

Whole-string rather than Char → Char because the mapping is not 1:1 — ß uppercases to SS — so a per-character signature could not express it and would silently corrupt such input.

Safety

s must point to a valid NovaStr.