I was checking the "Branches and Decisions" wiki entry at https://wiki.contextgarden.net/System_Macros/Branches_and_Decisions, and I saw that ConTeXt has a useful \doifalldefinedelse macro that checks a comma-separated list of macro names and proceeds according to whether or not all of the macros with those names are defined. I was curious as to whether or not there is also a \doifanydefinedelse (or, equivalently, a \doifallundefinedelse) macro that would check if any of the macros with names in the comma-separated list is defined (or, equivalently, if all of them are undefined). I don't see any mention of such a macro on the wiki page, so I wanted to ask: has something like this already been implemented, and if not, is there a simple way to do a check like this? This functionality would be useful for performing some checks on a key-value assignment, and passing a comma-separated list to a macro would be much cleaner than doing a bunch of nested if-else blocks.