How do you programatically determine who submitted a webform?
@beltouche: It should be noted that this YAML source creates a webform that internally stores the displayname property.  As a result the identified user is stored wherever the webform submissions are stored.  I now assume this is as designed.  It seems to me that the prepopulation of a webform using something like {{ user.displayname }} is best accomplished by using a block/webform hybrid content type.  Am I on the right track with this thinking?