[withinboredom]

The high level API shouldn’t care about state. In other words, your “readers” should merely aggregate state and your “writers” should only care about subsets of state.

Think about file permissions in Linux. Running ls just shows you gross file perms (current user, group, and global) but you can also grant access to other individual users, or even make a file immutable that still shows up as writable to ls. The high level api doesn’t know or care about the low level state except where it is relevant.