OptionalmaxMaximum size, in bytes, of the payload this client accepts from a single incoming data stream.
A compressed stream can inflate to an arbitrarily large payload, so the decompressed output is
bounded rather than trusting the size declared on the wire. An incoming stream that exceeds the
cap fails with a DataStreamErrorReason.PayloadTooLarge error on the next read instead of
buffering without bound.
This is enforced on the receiving side only: raising it on a sender has no effect.
Options controlling data stream behavior for a room.