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Python
Literal + match for Exhaustive Switching
`Literal` pins a value to specific strings/ints. Combine with the match statement (Python 3.10+) and a `_ : assert_never` clause for exhaustiveness — every variant must be handled or mypy yells at you.
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Rust
match with Guards, Ranges, and Bindings
`match` arms can have `if` guards, range patterns (`1..=5`), bindings (`x @ pattern`), and ORs (`A | B`). Combine them for very expressive dispatch.