Feature Request: "Cross off"/strikethrough tasks when in the month, week, or schedule view

It would be nice to have the ability to "cross off"/strikethrough a task when in the month, week, or schedule view. At present, marking a task as "complete" changes the icon beside the task from a small book icon to a blank page icon:

My request is for a full strikethrough line that is drawn through the task title, and/or some other visual indicator that the task has been completed (ex. the task could be greyed out).

I request this for two reasons: (1) it is satisfying to "cross off" tasks in the month/week/schedule view, and then at the end of the day see all that you have accomplished; and (2) I am not familiar with any other calendaring app that allows you to do this (which is one reason I have stuck to old fashioned pen and paper).

Perhaps additionally, the ability to "hide" completed tasks in the month, week, or schedule view would provide even more flexibility, depending on individuals' preferences.

Thank you for all your work on Kalendar!