Method decomposition

crates/stdlib/src/unicodedata.rs:237–253

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

        #[pymethod]
        fn decomposition(&self, character: PyStrRef, vm: &VirtualMachine) -> PyResult<String> {
            let ch = match self.extract_char(character, vm)?.and_then(|c| c.to_char()) {
                Some(ch) => ch,
                None => return Ok(String::new()),
            };
            let chars: Vec<char> = ch.decomposition_map().collect();
            // If decomposition maps to just the character itself, there's no decomposition
            if chars.len() == 1 && chars[0] == ch {
                return Ok(String::new());
            }
            let hex_parts = chars.iter().map(|c| format!("{:04X}", *c as u32)).join(" ");
            let tag = match ch.decomposition_type() {
                Some(DecompositionType::Canonical) | None => return Ok(hex_parts),
                Some(dt) => decomposition_type_tag(dt),
            };
            Ok(format!("<{tag}> {hex_parts}"))
        }

        #[pymethod]
        fn digit(