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HSIntro supports protocol versions 3 and 4:

   The "HSIntro" protocol handles introduction points.

   "3" -- supports authentication as of proposal 121 in Tor
          0.2.1.6-alpha.

   "4" -- support ed25519 authentication keys which is defined by the HS v3
          protocol as part of proposal 224 in Tor 0.3.0.4-alpha.

But rend_service_update_descriptor() says "intro protocols 2 and 3":

  /* Support intro protocols 2 and 3. */
  d->protocols = (1 << 2) + (1 << 3);

I think we need to delete "2" here.

And rend_service_descriptor_t says "introduce/rendezvous" 0-3:

  /** Bitmask: which introduce/rendezvous protocols are supported?
   * (We allow bits '0', '1', '2' and '3' to be set.) */
  unsigned protocols : REND_PROTOCOL_VERSION_BITMASK_WIDTH;

I think we need to delete "/rendezvous" and 0-2 here.

This seems to be a bug in 496fe68 in 0.2.5.3-alpha.