Function containsZero

src/compute-engine/interval/util.ts:121–123

(x: Interval)

 * Merge two domain clip indicators.
 *
 * Returns the combined clip indicator when both branches
 * have domain restrictions.
 */
export function mergeDomainClip(
  a: 'lo' | 'hi' | 'both' | null,
  b: 'lo' | 'hi' | 'both' | null