[IndexedDB] Exceptions on IndexedDatabaseRequest.open

What is the purpose of allowing IndexedDatabaseRequest (
http://dev.w3.org/2006/webapi/WebSimpleDB/#idl-def-IndexedDatabaseRequest)
to raise an exception?  The only mention of it in the spec is that it raises
a NON_TRANSIENT_ERR "if the name parameter is not valid".  But it's not
mentioned in
http://dev.w3.org/2006/webapi/WebSimpleDB/#dfn-steps-for-opening-a-database or
anywhere else as far as I can tell.

I don't see any reason to special case this one method with synchronous
properties.  "If the name parameter is not valid" or any other error, I
think it should be returned via an error callback just like everywhere else.

J