note to self

packages/svelte/src/internal/client/dom/blocks/each.js

@@ -41,6 +41,9 @@ import { DEV } from 'esm-env';
 import { derived_safe_equal } from '../../reactivity/deriveds.js';
 import { current_batch } from '../../reactivity/batch.js';
 
+// When making substantive changes to this file, validate them with the each block stress test:
+// https://svelte.dev/playground/1972b2cf46564476ad8c8c6405b23b7b
+
 /**
  * @param {any} _
  * @param {number} i