proc_lib man page unclear

Loïc Hoguin <[email protected]> Sun, 26 Apr 2015 15:30:03 +0300
Newsgroups gmane.comp.lang.erlang.bugs
Organization Nine Nines
Message-ID <[email protected]>
I am not sure by what is meant in the proc_lib man page:

Using the spawn option monitor is currently not allowed, but will cause 
the function to fail with reason badarg.

If the option is not allowed then surely one would expect it to fail 
with badarg? Why "but"?

-- 
Loïc Hoguin
http://ninenines.eu
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