export function readOptionalString(value: unknown): string | null {
  return typeof value === "string" && value.length > 0 ? value : null;
}

export function readPositiveNumber(value: unknown): number | null {
  if (typeof value === "number" && Number.isFinite(value) && value > 0) {
    return value;
  }
  if (typeof value !== "string" || value.trim() === "") {
    return null;
  }
  const parsed = Number.parseFloat(value);
  return Number.isFinite(parsed) && parsed > 0 ? parsed : null;
}