From 1f9affd979a726b4e7a2dd764a12af161815574d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ren=C3=A9?= <contact.9a5d6388@renegade334.me.uk>
Date: Wed, 1 Apr 2026 10:56:37 +0100
Subject: [PATCH] perf(collection): avoid duplicated population of new
 collections (#11473)

---
 packages/collection/src/collection.ts | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/packages/collection/src/collection.ts b/packages/collection/src/collection.ts
index 787e57f71..9e2930ef4 100644
--- a/packages/collection/src/collection.ts
+++ b/packages/collection/src/collection.ts
@@ -1023,7 +1023,10 @@ export class Collection<Key, Value> extends Map<Key, Value> {
 	 * but returns a Collection instead of an Array.
 	 */
 	public toReversed() {
-		return new this.constructor[Symbol.species](this).reverse();
+		const entries = [...this.entries()];
+		entries.reverse();
+
+		return new this.constructor[Symbol.species](entries);
 	}
 
 	/**
@@ -1039,7 +1042,10 @@ export class Collection<Key, Value> extends Map<Key, Value> {
 	 * ```
 	 */
 	public toSorted(compareFunction: Comparator<Key, Value> = Collection.defaultSort): Collection<Key, Value> {
-		return new this.constructor[Symbol.species](this).sort(compareFunction);
+		const entries = [...this.entries()];
+		entries.sort((a, b): number => compareFunction(a[1], b[1], a[0], b[0]));
+
+		return new this.constructor[Symbol.species](entries);
 	}
 
 	public toJSON() {