Move numbering kinds to Codex

Cargo.toml

@@ -11,5 +11,9 @@ categories = ["encoding", "text-processing"]
 keywords = ["unicode", "symbols"]
 
 [features]
-default = ["styling"]
+default = ["styling", "numeral-systems"]
+numeral-systems = ["chinese-number"]
 styling = []
+
+[dependencies]
+chinese-number = { version = "0.7.7", default-features = false, features = ["number-to-chinese"], optional = true }

src/lib.rs

@@ -11,6 +11,9 @@ pub use self::shared::ModifierSet;
 
 mod shared;
 
+#[cfg(feature = "numeral-systems")]
+pub mod numeral_systems;
+
 #[cfg(feature = "styling")]
 pub mod styling;