Function yyjson_mut_get_type_desc 

pub unsafe extern "C" fn yyjson_mut_get_type_desc(
    val: *mut yyjson_mut_val,
) -> *const c_char

Returns the JSON value’s type description. The return value should be one of these strings: “raw”, “null”, “string”, “array”, “object”, “true”, “false”, “uint”, “sint”, “real”, “unknown”.