feat:unicode changed api, added feature

Cargo.toml

@@ -53,6 +53,8 @@ with-juniper-support = ["juniper"]
 with-postgres-support = ["postgres-types", "byteorder", "bytes"]
 with-serde-support = ["serde", "serde_derive", "num/serde"]
 
+with-unicode = []
+
 [dev-dependencies]
 criterion = "0.4"
 rand = "0.8.5"

src/fraction/mod.rs

@@ -5,7 +5,9 @@ pub use self::sign::Sign;
 pub mod approx;
 
 pub mod display;
-mod unicode_fromto_str;
+
+#[cfg(feature = "with-unicode")]
+mod unicode_str_io;
 
 #[cfg(feature = "with-juniper-support")]
 pub mod juniper_support;