package irmin-pack

v ?on_disk repo create a snaphot instance. The traversal requires an index to keep track of visited elements.

• if on_disk is not specified, the index is in memory.
• if on_disk is `Path path, a temporary index is created at path.
• if on_disk is `Reuse the store's index is reused.

save_elt snapshot elt saves elt to the store.

close snapshot close the snaphot instance.