[IndexedDB] What happens when the version changes?

Hey all,

A recent concern that we have come across at Mozilla is what happens 
when the version changes?  Do we silently continue to work and hope for 
the best?  Do we throw an error every time saying that the version this 
database was opened with is no longer the version of the database?  It's 
not at all clear on what we should be doing in the spec, so we'd love to 
hear thoughts on this.  (We don't have a solution we are happy with yet 
to this problem either, so other options would be great).

Cheers,

Shawn