arbitrary_precision without std

Author: kvinwang

src/number.rs

@@ -14,6 +14,12 @@ use crate::error::ErrorCode;
 #[cfg(feature = "arbitrary_precision")]
 use serde::de::{IntoDeserializer, MapAccess};
 
+#[cfg(feature = "arbitrary_precision")]
+use alloc::{
+    borrow::ToOwned,
+    string::{String, ToString},
+};
+
 #[cfg(feature = "arbitrary_precision")]
 pub(crate) const TOKEN: &str = "$serde_json::private::Number";