urls starting with double / causes iron-location to "forget" hostname when generating urls

[s-oliver]

Description

when the url starts with a double slash (or more), iron-location generates an incorrect url (hostname is left out). When trying to set this invalid url through the history api, a DOMException is raised ( DOMException: Failed to execute 'pushState' on 'History')

Expected outcome

The host should still be included in the generated url, and the history push state should work as expected

Actual outcome

unhandled DOMException, breaking all following script execution

[dmytrothoughtandfunction]

@s-oliver I have a same issue in iOS 10. Any news, Polymer's team?