[Zope] Different field conversion for lines and ulines : why?

Hi, I would like to know why lines fields are not converted with the same logic as ulines fields in Zpublisher.Converters. lines uses splitlines() while ulines uses split('\n') This gives different result:

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''.splitlines() [] ''.split('\n') [''] u''.splitlines() [] u''.split('\n') [u'']

So, when creating an empty Zope property for example, ulines version value will be (u'',) while lines version value will be () Thanks. Pascal