Feature Request: End dates for recurring tasks

[AbuAbdAllah]

bismillah. no idea whether this was in the poll for new feature, but
it sounds like something that would have been suggested previously.

the recurring tasks feature is so useful but this functionality would
improve it.

many recurring tasks have a fixed duration, or they come to an end
when the task becomes irrelevant. right now a person can only delete
the task. but with an end date, the person could end the task without
losing the completion history.

any format would work but i suggest "until" and a short form "un"
followed by a date. a person could also write "until5" or
"un5"meaning until 5 instances have taken place. and the feature
would work with other date features like "ev" and "@".