message: Update `isMonday` to use correct argument name
diff: @@ -25,5 +25,5 @@ import requiredArgs from '../_lib/requiredArgs/index'
  export default function isMonday(date: Date | number): boolean {
  requiredArgs(1, arguments)
  - return toDate(dirtyDate).getDay() === 1
  + return toDate(date).getDay() === 1
  }
  