message: fix(datepicker): avoid mutating value in daterangepicker
  fixes
diff: @@ -139,14 +139,14 @@ export class BsDaterangepickerInputDirective
  }
  validate(c: AbstractControl): ValidationErrors | null {
  - const _value: [Date, Date] = c.value;
  + let _value: [Date, Date] = c.value;
  const errors: Record<string, unknown>[] = [];
  if (_value === null || _value === undefined || !isArray(_value)) {
  return null;
  }
  - _value.sort((a, b) => a.getTime() - b.getTime());
  + _value = _value.slice().sort((a, b) => a.getTime() - b.getTime()) as [Date, Date];
  const _isFirstDateValid = isDateValid(_value[0]);
  const _isSecondDateValid = isDateValid(_value[1]);
  