On Mon, Nov 7, 2016 at 8:18 AM, Josh Triplett <josh@xxxxxxxxxxxxxxxx> wrote: > Once we have gitrefs, you have both alternatives: reachable (gitref) or > not reachable (gitlink). > > However, if you want some way to mark reachable objects as not > reachable, such as for a sparse checkout, external large-object storage, > or similar, then you can use a single unified mechanism for that whether > working with gitrefs, trees, or blobs. How? Whether an object reachable or not is baked in the definition (of either gitlink or gitref). I don't think you can have a "maybe reachable" type then rely on an external source to determine reachability, -- Duy