const GUIDE_SESSION_LIMITS: { sceneBytes: 1500; sdpBytes: 65536 }
The bounds of a session request, both in UTF-8 bytes: the request goes to the provider as an encoded body, so bytes are what the adapter holds it to. The Worker refuses past them before it spends a provider call, and the browser's opening line is written to fit under them.
guideWire.ts:102