Prototype possible implementations of below, especially let and switch. These are important and in the top 50, but because they are unusual in some way, special care should be taken to implement them in a way that properly fits with the rest of the API. We are not committed to including these in the initial release, but we do need to spend some time exploring how these could be implemented.

• let (36th)
• switch (10th)
• meta
• literal
• if_null