I will demo and discuss two little blocks language affordances that have been working nicely in GP:

1. Variadic blocks that can be extended to take additional inputs, including a variadic if that can be expanded to handle as many else if cases as desired.
2. Slots that guess the type of an input value (number or string) but can be manually overridden. This mechansm does what the user wants 99% of the time and for the rare exceptional case (e.g. when they want to treat 123 as a string, not an integer) there’s a way for them to tell the system their intention.