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sub fooprintf (*$fmt, *@args) { ... }
sub barprintf ($fmt, *@args) { ... }
...
barprintf($format, @data); #this works
barprintf(@both);          #this won't work
barprintf(*@both);         #but this will

fooprintf(localtime); #localtime is called in array context
barprintf(localtime); #localtime is called in scalar context