quic.QuicStream.highWaterMark

The maximum number of bytes that the writer will buffer before writeSync() returns false. When the buffered data exceeds this limit, the caller should wait for drain before writing more.

The value can be changed dynamically at any time. This is particularly useful for streams received via the onstream callback, where the default (65536) may need to be adjusted based on application needs. The valid range is 0 to 4294967295.