Case insensitive parse about date-and-time HOT 1 CLOSED

Requests for the behavior of the parser are varied, sometimes conflict with each other, so we can't accept all of them. Since we have implemented a mechanism to extend this library, you can use it to rewrite the behavior of the parser as you wish. However, if it ignores case, even such following inputs are allowed as well, it's OK?

JUL
jUL
juL
jUl

If it's OK, for example, append such the following code:

date.extend({
    parser: {
        MMM: function (str) {
            var result = this.find(this.res.MMM.map(m => m.toLowerCase()), str.toLowerCase());
            result.value++;
            return result;
        }
    }
});

from date-and-time.