Function sourceSetKey

src/views/DataThread.tsx:1208–1208

(ids: string[])

    // would always mismatch and emit a redundant merge node on the very
    // first derivation in the thread.
    const sourceSetKey = (ids: string[]): string => [...ids].sort().join('\x1F');
    const initialSourceIds: string[] = (() => {
        if (!parentTable) return [];
        // If parentTable is a root (no derive) or anchored, it IS the source.