tweak

src/compiler/compile/nodes/shared/Expression.ts

@@ -399,7 +399,7 @@ export default class Expression {
 						}
 					});
 
-					invalidate(component, scope, code, node, Array.from(traced));
+					invalidate(component, scope, code, node, traced);
 				}
 			}
 		});

src/compiler/compile/render_dom/index.ts

@@ -179,7 +179,7 @@ export default function dom(
 					// onto the initial function call
 					const names = new Set(extract_names(assignee));
 
-					invalidate(component, scope, code, node, Array.from(names));
+					invalidate(component, scope, code, node, names);
 				}
 			}
 		});

src/compiler/compile/utils/invalidate.ts

@@ -4,7 +4,7 @@ import { Node } from '../../interfaces';
 import { nodes_match } from '../../utils/nodes_match';
 import { Scope } from './scope';
 
-export function invalidate(component: Component, scope: Scope, code: MagicString, node: Node, names: string[]) {
+export function invalidate(component: Component, scope: Scope, code: MagicString, node: Node, names: Set<string>) {
 	const [head, ...tail] = Array.from(names).filter(name => {
 		const owner = scope.find_owner(name);
 		if (owner && owner !== component.instance_scope) return false;