Add `.params()` to `sfg.function`. Change `std.tuple` to take type params as...
Add `.params()` to `sfg.function`. Change `std.tuple` to take type params as `*args`. Extend composer guide. Add composer feature test.
Add `.params()` to `sfg.function`. Change `std.tuple` to take type params as `*args`. Extend composer guide. Add composer feature test.