CodeComparison

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math.tsbefore

export function add(a: number, b: number) {
  return a + b // [!code focus]
}

math.tsafter

export function add(a: unknown, b: unknown) {
  // [!code ++] if (typeof a !== 'number' || typeof b !== 'number') return 0
  // [!code ++] // added basic runtime guard
  return (a as number) + (b as number) // [!code focus]
}