cubicweb #3210365 url /<etype>/<eid> should work if <eid> is a subtype of <etype> [validation pending]

eg workcase/1234 should work if 1234 is a training and training specializes workcase.

prioritynormal
typeenhancement
done in3.18.0
load0.200
load left0.000
closed by#31a1813d53f3 [entity/url publishing] fetch_rqlst should use 'is_instance_of' instead of 'is'
patch[entity/url pulishing] fetch_rqlst should use 'is_instance_of' instead of 'is' [applied]