fix: don't run each array expression more often than necessary #14992
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closes #14991 - at least to the extent possible
Also adjusts a comment which a) did not hint at why it's needed in the first place (was added in #14967) b) sounded like we could change that in the future, but we can't, because people will always have the ability to trigger reactivity through other means without changing the array reference
Before submitting the PR, please make sure you do the following
feat:,fix:,chore:, ordocs:.packages/svelte/src, add a changeset (npx changeset).Tests and linting
pnpm testand lint the project withpnpm lint