block38.ts

export function checkBinding(
    view: ViewData, def: NodeDef, bindingIdx: number, value: any): boolean {
  const oldValues = view.oldValues;
  if ((view.state & ViewState.FirstCheck) ||
      !looseIdentical(oldValues[def.bindingIndex + bindingIdx], value)) {
    return true;
  }
  return false;
}

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  V
export function looseIdentical(a: any, b: any): boolean {
  return a === b || typeof a === 'number' && typeof b === 'number' && isNaN(a) && isNaN(b);
}