FUNCTIONAL-PROGRAMMING5 MIN READ
Coach a teammate away from shared mutation
Use the values-vs-identity frame to coach a teammate toward immutable state updates.
Dani D Backend engineer 1 Risk 2 Alternative 3 Performance PR review 20 sec The moment Dani's PR mutates a shared session object from a permission handler. Billing, audit, and the response builder all receive the same object reference. If multiple readers share one mutable value, the code cannot promise which state each reader saw. readers of session shared reference 0 new framework needed
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