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What is TypeVarTuple and Unpack for variadic generics?

Q: What is TypeVarTuple and Unpack for variadic generics?

`TypeVarTuple` (PEP 646, 3.11) lets a generic capture an arbitrary tuple of types: `tuple[*Ts]`; `Unpack` spreads it. Generic[T] one type Generic[*Ts] many | | TypeVar | TypeVarTuple | |---|---|---| | Arity | One type | Variable length tuple of types | | Syntax | `Generic[T]` | `Generic[*Ts]` where `Ts = TypeVarTuple('Ts')` | | Example | `list[T]` | `tuple[*Ts]`, `Array[*Shape]` | | Unpack | `Unpack[TypedDict]` | `*Ts` in `tuple[*Ts]` | It types `Array[*Shape]`, `Callable` with precise args, and typed `zip`/`map` ove

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PEP 646 variadic generics — typing heterogeneous tuples/arrays.

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TypeVarTuple (PEP 646, 3.11) lets a generic capture an arbitrary tuple of types: tuple[*Ts]; Unpack spreads it.

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