It'd be interesting, what you miss from the current implementation!?
It claims to be version 1.6, but from the revision history there weren't significant changes since then:
XEP-0124: Bidirectional-streams Over Synchronous HTTP (BOSH)
XEP-0206 is another thing, afaik it's completely missing (at least the xbosh attributes). Nonetheless it works with a 1.11 client.