Progress bar to reduce

[totvi]

Would it be possible to add .progress as an argument to reduce (and relatives, e.g., accumulate and reduce2)? Some times you may use reduce in stead of map_dfr to achieve similar output, but the former doesn't provide options for progress bar.

[samuel-marsh]

Seconding this! :)

[hadley]

I think it would be posisble, although it might be tricky to do it as performantly as with map() since there the progress bar (and the iteration) is implemented in C.