When should you avoid a fancy use of mutation and copying?
How does mutation and copying affect maintainability?
What state reasoning matters with mutation and copying?
What naming guidance fits mutation and copying?
What boundary guidance fits mutation and copying?
What data-shape guidance fits mutation and copying?
What failure handling lens fits mutation and copying?
What performance guidance fits mutation and copying?
What team communication lens fits mutation and copying?
What senior-level judgment belongs with mutation and copying?