Function soil_decode 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn soil_decode(
    runtime: *mut SoilRuntime,
    shape_json: *const c_char,
    value_json: *const c_char,
    err: *mut *mut SoilError,
) -> *mut Value

Type-directed decode — parse (design §3.7). shape_json is a shape in the descriptor-JSON encoding ({"tag": "Named", "value": "Doc"}, {"tag": "List", "value": {"tag": "I64"}}, …).

Safety

runtime is live; both strings are NUL-terminated UTF-8; err null or valid.