Comment 1 for bug 948339

> Setting values via the config stack triggers a write even though the branch is locked. (test_set_delays_write)

Fixed in the associated branch.

> Retrieving values via the config stack of an unlocked branch does not trigger a read, even if the branch is explicitly unlocked (test_use_fresh_values)

See https://code.launchpad.net/~vila/bzr/948339-config-caching/+merge/97256 for why the cost of addressing this is way too high when the aim is to reduce IOs.