invalid date not working


 Q:   How can I check for invalid combination of a year-month-day ?!

when I create a new date with invalid month or day it is transformed to another valid date :

   const birthDate = new DateObject({
      year: 1942,
      month: 84,
      day: 55
    })

    console.log(birthDate.format('YYYY-MM-DD'), birthDate.isValid) //1949-01-24 true
    (expected: 1942-84-55, false)
    