Lambdas

If you've evaluated some code that returns a lambda, you'll have seen the ugly internal representation that you shouldn't have to. However, having such a representation is necessary if we want to be able to write tasks to disk but at the same time pass lambdas between tasks (along with captured environments!).

This format is undefined. Please do not make your programs inspect the list of values that represent a lambda function as if this format changes, your program will probably break.