Treat state as a timeline of values
Explain why immutable values reduce coordination problems in shared-state code.
The move: separate the thing from the value it currently has. Teams often say "the account changed" when they mean two different things. The account is the identity: the continuing business entity. The balance, limits, holds, status, and timestamps are state values associated with that identity at specific moments. Why mutation creates coordination cost If several functions share the same mutable object, every reader must wonder whether another writer is changing it. That uncertainty spreads. Tests need setup and teardown. Debuggers show values that may already have moved. Logs capture partial transitions unless the team is careful. Why immutable snapshots…
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