Hi, nickvet419!
My name is Anastasia, and I'm Artem’s teammate. Thanks for the reply!  Glad to hear that you don’t mind our suggestion, we will modify tag highway=corridor to highway=footway+indoor=yes. 
However, we will still consider the possibility of routing through ways with this tag too since it is one of the acceptable approaches of mapping indoors in OSM. 
Thanks for your contribution and for the detailed response!
Best regards!