Method combining

crates/stdlib/src/unicodedata.rs:229–234

(&self, character: PyStrRef, vm: &VirtualMachine)

        #[pymethod]
        fn combining(&self, character: PyStrRef, vm: &VirtualMachine) -> PyResult<i32> {
            Ok(self
                .extract_char(character, vm)?
                .and_then(|c| c.to_char())
                .map_or(0, |ch| ch.canonical_combining_class() as i32))
        }

        #[pymethod]
        fn decomposition(&self, character: PyStrRef, vm: &VirtualMachine) -> PyResult<String> {