Make JSContextRef::wrap_rust_value private

While investigating #486
I realized that this function is still public, which shouldn't be the
case as it's only used for wrapping closure types, which is an internal
detail about the crate.

crates/quickjs-wasm-rs/CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Changed
+- Make `JSContextRef::wrap_rust_value` private. Similar to
+  `context::get_rust_value` this function is simply an internal detail.
+
 ## [2.0.1] - 2023-09-11
 
 ### Fixed

crates/quickjs-wasm-rs/src/js_binding/context.rs

@@ -315,7 +315,7 @@ impl JSContextRef {
     }
 
     /// Wrap the specified Rust value in a JS value
-    pub fn wrap_rust_value<T: 'static>(&self, value: T) -> Result<JSValueRef> {
+    fn wrap_rust_value<T: 'static>(&self, value: T) -> Result<JSValueRef> {
         // Note the use of `RefCell` to provide checked unique references.  Since JS values can be arbitrarily
         // aliased, we need `RefCell`'s dynamic borrow checking to prevent unsound access.
         let pointer = Box::into_raw(Box::new(RefCell::new(value)));