debugonce() functions are not considered as debugged

debug(fun) marks "fun" for debugging, it makes sure that whenever "fun" 
is called, the debugger is entered
undebug(fun) removes this mark; it won't stop any current debugging of 
that function
isdebugged(fun) tells whether this mark is set or not; it does not tell 
whether "fun" is currently running in a debugger/browser

debugonce(func) adds a different mark to the function, one that makes 
sure the first time "fun" is called, the debugger is entered; this is 
the same as when entering that function via "s" while debugging its 
caller. There is no way to query or unset this mark.

Do you have a good use case when it would be useful to query/unset the 
mark for debugonce?

Best,
Tomas

debugonce() sets a different flag (RSTEP), and this is not queried by
isdebugged(), and it is also not unset by undebug().

Is this expected? If yes, is there a way to query and unset the RSTEP flag
from R code?

? f <- function() { }
? debugonce(f)
? isdebugged(f)
[1] FALSE

? undebug(f)
Warning message:
In undebug(f) : argument is not being debugged

? f()
debugging in: f()
debug at #1: {
}
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