const truthy = new Set(["1", "on", "true"]);
const falsey = new Set(["0", "off", "false"]);
export function parseBoolean(val: string | number | boolean | undefined | null): boolean {
  if (val == null) return false;
  if (typeof val === "boolean") return val;
  if (typeof val === "number") return val === 1;
  val = val.trim().toLowerCase();
  if (truthy.has(val)) return true;
  if (falsey.has(val)) return false;
  return Boolean(val);
}