listfield in code source

Hi,

I have a list field in an external source that requires newlines to be present 
(each line is a separate item).  In the forms-based editor, newlines are 
retained when the source is saved.  However in kupu, the newlines are 
stripped, which breaks this code source.

Is there any way to work around this?  I could probably detect where the 
newlines are "supposed" to be, and insert them on save, but how do I do this?  
Is it possible to use an external validator method in formulator to change 
the value of a field before it is saved?

I could put the newline detection in the rendering script, but then the list 
field in kupu would show one long line instead of multiple items.

I have tried using a multi list field as well, but it behaves in the same 
manner.

Thanks for the assistance,
Andy