Finds the top level named val that triggered the execution of this val.
(Ignores any untitled vals, since those are sometimes created as an execution context.) By passing a function as the first argument you receive all references as arguments, and can pick or transform them, e.g. @karfau.refToValUrl Possible Limitation: https://discord.com/channels/1020432421243592714/1143386413748994143
