Remove overhead of to_dict/from_dict in test_snapshot_large.
This should make it fast enough not to exceed the deadline.
Depends on !449 (closed). (To actually be under the deadline.)
Migrated from D3485 (view on Phabricator)
This should make it fast enough not to exceed the deadline.
Depends on !449 (closed). (To actually be under the deadline.)
Migrated from D3485 (view on Phabricator)