in Sources/NIOTransportServices/NIOTSConnectionChannel.swift [83:91]
mutating func writabilityChanges(whenQueueingBytes newBytes: Int) -> Bool {
self.outstandingBytes += newBytes
if self.outstandingBytes > self.waterMarks.high && self.writable.load() {
self.writable.store(false)
return true
}
return false
}