If i define a boolean field as:

Field("mybool", "boolean", required = False, notnull = False, default = None
)

Its stored as False if its not present in request.post_vars. The proper 
behaviour would be to store a null value in this case, which allows to 
handle boolean's tri-states.

To achieve bool tri states i have to hack the form after is processed like:
if request.post_vars.mybool == None:
    form.vars.mybool = None

Is there an easier/cleaner way to achieve this?

Thanks.

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