Function shouldFlatten

src/compute-engine/boxed-expression/flatten.ts:29–32

(x: Expression)

  if (operator) {
    const shouldFlatten = (x: Expression) =>
      isSymbol(x, 'Nothing') ||
      x.operator === operator ||
      x.operator === 'Sequence';

    // Bypass memory allocation for the common case where there is nothing to flatten
    if (xs.every((x) => !shouldFlatten(x))) return xs as T;