PropertyMapper chokes on Objects that are already converted
I've noticed that the PropertyMapper chokes on Objects which are already in the Target form.
This happened to me with the TYPO3.Form Project in case where the DatePickerViewHelper already transforms the Value to a DateTime and the FormHandler later tries to map it again which fails because he isn't supposed to handle objects.
In this case i would suggest, to check if the source property is of the target property and skip it in that case.
Here's the origination ticket: