multiselect compability problems in IE11

Dear support,

as far I know you officially don't support IE11 browser. But many corporate users (my company as well) have IE11 as a standard and it could take long time, all users will get Edge or Chrome.

That's why it wozld be helpfull if multiselect wouuld have full functionality in IE11 too. Main Problem: search is not working Error appears on every character entering in search field: SCRIPT438: Das Objekt unterstützt die Eigenschaft oder Methode "includes" nicht mdb.min.js (1,268823) it doesnt help to change (in mdb.js):

//  to fix problem with IE11
 // if (liValue.includes(searchValue.toLowerCase())) {
      if (liValue.indexOf(searchValue.toLowerCase())) {
...

Second: selection is working, but I have errors in the console on every click on any option I have error:

   Das Objekt unterstützt diese Aktion nicht.
 mdb.min.js (1,264499)

Please try us to improve this behavior, espeacially search. Thanks