[Zope] quoting in Z2.log

I post process the Z2.log file to gather some specialized usage data. I have a few examples of log postings which don't conform to the cgi-standard even though the data either originates from a form (<textarea> typically) or is appended to a redirect action in the usual ?name=value&name=value... form. Values are all passed through quote_plus. The observed effect is the presence of unquoted carriage-returns (well, actually newlines as the local environment is Linux) in the logfile. Can anyone suggest where they are coming from?