More work on WASM handling.

src/utils/string_key.rs

@@ -1,3 +1,4 @@
+use std::borrow::Borrow;
 use std::fmt::{Display, Formatter};
 use std::hash::{Hash, Hasher};
 use std::ops::Deref;
@@ -5,7 +6,6 @@ use std::sync::{Arc, Mutex, Weak};
 
 use conquer_once::OnceCell;
 use hashbrown::HashMap;
-use indexmap::Equivalent;
 
 /// StringKey is an immutable string that is used for indexing of hashmaps or equality a lot.
 /// By reference counting the string instead of copying, and caching the hash, we can get some
@@ -103,9 +103,9 @@ impl From<&str> for StringKey {
     }
 }
 
-impl Equivalent<StringKey> for u32 {
-    fn equivalent(&self, key: &StringKey) -> bool {
-        *self == key.hash
+impl Borrow<u32> for StringKey {
+    fn borrow(&self) -> &u32 {
+        &self.hash
     }
 }