In my record-update controller, after SQLFORM.validate(), I'd like to 
programmatically change some of the submitted form values, and then present 
the form again (with the changed values) for further editing. Imagine a 
sort of autocomplete of partially filled forms. 

My controller has the standard control flow with self-submission, and 
returns dict(form=form) as usual. However, there should be no database 
update until the final (unaltered) submission. (I'm already doing this 
manually, without SQLFORM.process.)

How can I alter the submitted values? Simply assigning "form.vars.my_field 
= my_new_value", and then returning the form doesn't seem to work.

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