[Twisted-Python] passing exception object to log.err doesn't log traceback?

[Paul Wiseman]

I was just looking at some logs and some of the errors logged without
tracebacks, I work out it was when I wasn't passing the error object to
log.err- Is this by design?

Here is some code which shows it logging and not logging the traceback

import os
from twisted.python import log
from twisted.python.logfile import DailyLogFile

logfile=
DailyLogFile.fromFullPath(os.path.join(os.path.dirname(__file__),"error.log"))
log.startLogging(logfile)

def zero_error():
    1/0

def stack(x):
    if not x:
        zero_error()
    else:
        stack(x-1)

def work(x,pass_exception):
    try:
        stack(x)
    except Exception as e:
        log.err(e if pass_exception else None)

if __name__ == "__main__":
    work(5,True) #Doesn't log traceback
    work(5,False) #Does log
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