Re: [PATCH v4 0/8] rev-list: implement object type filter

> I don't think it would help usability to add new `--show-blobs` and
> `--show-trees` options. The user interface to show this kind of
> information exists already with `--objects`, and by adding another way
> of asking a similar query would raise the question of how these two ways
> interact with each other:
> 
>     - Does `--show-blobs` have effect if `--objects` is not set?
> 
>     - Is `--objects` redundant if we have `--show-blobs`, or would
>       `--objects --show-blobs` list all objects regardless of whether
>       they're blobs or not?
> 
>     - What would happen if the user says `--show-blobs --no-objects`?
> 
>     - Are these options mutually exclusive?
> 
> We avoid all these questions by just adding it as a filter.

> Furthermore, the filter also allows future iterations which build on top
> of this. If we had a combined OR filter in addition to the existing
> combined AND filter, the user could say "Give me all blobs which aren't
> bigger than a specific size PLUS all trees with a depth smaller than 5
> PLUS all commits and tags". It's not like I'd know of a specific usecase
> for this right now, but I think the potential of having such filters in
> the future is a plus.