using set instead of array for search (#7126)

* Resolve #6905

* Resolve #6905

* Resolve #6905

src/server/api/stream/channels/home-timeline.ts

@@ -19,10 +19,10 @@ export default class extends Channel {
 	@autobind
 	private async onNote(note: PackedNote) {
 		if (note.channelId) {
-			if (!this.followingChannels.includes(note.channelId)) return;
+			if (!this.followingChannels.has(note.channelId)) return;
 		} else {
 			// その投稿のユーザーをフォローしていなかったら弾く
-			if ((this.user!.id !== note.userId) && !this.following.includes(note.userId)) return;
+			if ((this.user!.id !== note.userId) && !this.following.has(note.userId)) return;
 		}
 
 		if (['followers', 'specified'].includes(note.visibility)) {