Client side column sorting Case Sensitive

Is there a configurable option to remove case sensitivity on the client side grid element ?

It first displays all Numbers, followed by Capitals and then by small letters.
Right now we are using the default option for doing the sort.

The thread
https://vaadin.com/forum/#!/thread/339715/14987401
suggests this for Java grid.
“The sorting is not performed by the Table but by the Container behind it”

Do we need to handle for client also in similar way ?