```ts
/** a divided by b. */
export function safeDivide(a: number, b: number): number {
  if (!Number.isFinite(a) || !Number.isFinite(b)) {
    throw new Error('Both arguments must be finite numbers');
  }
  if (typeof a === 'boolean' || typeof b === 'boolean') {
    throw new Error('Arguments cannot be booleans');
  }
  if (b === 0) {
    throw new Error ('Cannot divide by zero');
  }
  return a / b;
}
```