small tweak

packages/svelte/src/reactivity/set.js

@@ -29,12 +29,12 @@ function get_self() {
 	return this;
 }
 
+let inited = false;
+
 /**
  * @template T
  */
 export class ReactiveSet extends Set {
-	static #inited = false;
-
 	/** @type {Map<T, import('#client').Source<boolean>>} */
 	#sources = new Map();
 	#version = source(0);
@@ -55,13 +55,13 @@ export class ReactiveSet extends Set {
 			}
 		}
 
-		this.#init();
+		if (!inited) this.#init();
 	}
 
 	// We init as part of the first instance so that we can treeshake this class
 	#init() {
-		if (!ReactiveSet.#inited) {
-			ReactiveSet.#inited = true;
+		inited = true;
+
 		const proto = ReactiveSet.prototype;
 		const set_proto = Set.prototype;
 
@@ -74,7 +74,6 @@ export class ReactiveSet extends Set {
 			};
 		}
 	}
-	}
 
 	#increment_version() {
 		set(this.#version, this.#version.v + 1);