Cannot fetch from remote into MemoryRepo

[Conan]

Using code something like:

client = GitClient(...)
local = MemoryRepo()
remote_refs = client.fetch(path, local)

I cannot fetch from a remote repo into a local in-memory repository.

I instead recieve the following exception:
AttributeError: 'MemoryObjectStore' object has no attribute 'add_pack'

Looking at the code for MemoryObjectStore it seems to be missing all of the pack storage functionality.

[Jelmer Vernooij (jelmer)]

As mentioned on IRC, this is mostly because supporting packs requires some more work that simply hasn't done yet.