Maybe I'm just tired, but in beforeSubmit XEDIT how can I identify if a value has been changed to blank or just wasn't one of the fields that changed?

best documentation on this is sadly ss1, so you will have to do minor translation

ah thanks!

@Watz that's right, if the field name is returned by a call to getFields, it's been updated and the new value (even if empty) can be retrieved using a call to getValue

Yes, and as the context.oldRecord contains the values that didn't change it is safe to get the current ones from there.