Yep the problem is very much reduced but it still exists: an API/DSL provider that hinges on blocks can change the args under your feet and it would only blow u

Yep the problem is very much reduced but it still exists: an API/DSL provider that hinges on blocks can change the args under your feet and it would only blow up when the argument values start to receive unexpected methods, instead of at the interface. As you mentioned, lambdas and methods check for that, but it’s sad to have to give up the syntactic and lexical niceties of blocks.