Nitpick: this isn't really about persistent state specifically, but any shared (and especially mutable) state, including but not limited to state shared across

Nitpick: this isn't really about persistent state specifically, but any shared (and especially mutable) state, including but not limited to state shared across multiple temporally-nonoverlapping instances of the same program. Eg, compare when 'foo' is provided as input or fetched across a network.