text: import { isNum } from './isNum'
  
  /**
   * @function
   * @param {*} x
   * @returns { boolean } true if x is a negative number
   * @example isNegative(-1) // true
   * @example isNegative(0) // false
   */
  export const isNegative = x => isNum(x) && x < 0
  