save some work when stack is only one level deep
save some work when stack is only one level deep

danvk/oldnyc,nypl-spacetime/oldnyc,luster/oldnyc,danvk/oldnyc,nypl-spacetime/oldnyc,nypl-spacetime/oldnyc,danvk/oldnyc,luster/oldnyc,luster/oldnyc,nypl-spacetime/oldnyc,luster/oldnyc,luster/oldnyc,nypl-spacetime/oldnyc,danvk/oldnyc