Document optional chaining#2722
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Add an optionals page under the types chapter and link it from the guide summary. The page introduces optionals like ?T, shows how is not None and isinstance establish the non-None case, walks through explicit checks for nested data, and then presents optional chaining as the shorter form when None should propagate. Beginner-only examples are included where the extra concrete detail helps.
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Add an optionals page under the types chapter and link it from the guide summary. The page introduces optionals like ?T, shows how is not None and isinstance establish the non-None case, walks through explicit checks for nested data, and then presents optional chaining as the shorter form when None should propagate. Beginner-only examples are included where the extra concrete detail helps.