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Performance

Check out benchmark data Internals that affect performance and recommended hot-path strategies.

Topics:

VarData union layout and memory model
Which types are heap-allocated (string, list, dict, set, ordered variants, graph)
Cost of copy vs move; move semantics examples
Fast-path cache and type_tag() usage
Guidelines: use is_*() + as_*_unchecked() in hot loops; prefer type_cstr() over type() in hot code

Notes on future improvements (smart pointers, variant refactor).