ugo 1,234 gives an error as you should use
ugo time 1,234. Anecdotal evidence shows that even experienced users often forget to spell the full command.
It would be possible to make the
ugo command smarter when it can infer what the user meant, so
ugo 1,234 would be treated as
ugo time 1,234 and
ugo my-bookmark-name as
ugo bookmark my-bookmark-name.
To make this work properly we would also need to modify other commands to be more helpful. For instance, if you use
ubookmark start to create a bookmark called
start, then the command could warn you that you will have to use the full
ugo bookmark start form to avoid ambiguity with the
ugo start command. (Details on how this would work are still undecided.)