daysOfWeek array of String - Duplicated key if using ['M', 'T', 'W', 'T']

[fidalgodev]

If you use an array of string for the days of the week like this:

daysOfWeek={['M', 'T', 'W', 'T', 'F', 'S', 'S']}

The package will use duplicated keys and bug when clicking on days... Maybe instead of using the values of the array for the keys, use the index of the value?