Use references for JSON metadata.

src/module/mod.rs

@@ -22,6 +22,8 @@ use std::{
 
 /// A type representing the namespace of a function.
 #[derive(Debug, Clone, Copy, Eq, PartialEq, Ord, PartialOrd, Hash)]
+#[cfg_attr(feature = "metadata", derive(serde::Serialize))]
+#[cfg_attr(feature = "metadata", serde(rename_all = "camelCase"))]
 #[non_exhaustive]
 pub enum FnNamespace {
     /// Module namespace only.