[Zope] Uninteligible error messages

Quite often, the error messages from zope are not helpful (IMHO). For example, does anyone know why doing this in a python script: script.manage_addProperty("test","null/null/null","date") gives the error: AttributeError: SyntaxError instance has no attribute 'replace' But a differently-bad date, like this: script.manage_addProperty("test","null","date") gives the error: IndexError: string index out of range Neither of which is particularly helpful at diagnosing the error. Why can't it return something like "DateException could not convert string to date" Does this count as a bug that should go in collector? Robert (Jamie) Munro