I have a big question. What need to do with message protocol? If we write name in Parse message we store prepared statement. I see some solutions for this problem but all not ideal: 1. We can add second char token for parse message. But too serious change. 2. We can try add parameter to tail of message. But in tail we have variable length array with parameters. 3. Detect prefix of prepared name. For example "__". Effects think clear.
I really, really doubt you can change this before we do a protocol version bump. The current protocol is too inflexible and doesn't have any kind of capabilities negotiation. I don't think any of those options can work.
