When I try to use the built-in action ListAny in a client action that needs to be a function, I currently get the error message saying 

Only actions that are functions can be used in other functions.

From the documentation I get it that you don't want to perform asynch or server calls within a client function, but surely ListAny (or any other 'harmless' action) should be allowed? 

Or, at the very least, please make a function version of the built-ins ListAny, ListIndexOf and ListAny available.