AsyncSocket seems to be dropping data

[spip]

Same assertion error on Linux.
    
    
    ...
    RCVD #269:  000269 This is message #269 of ∞. Please stay tuned for more. 
000269 This is me...
    RCVD #270:  000270 This is message #270 of ∞. Please stay tuned for more. 
000270 This is me...
    RCVD #715:  000715 This is message #715 of ∞. Please stay tuned for more. 
000715 This is me...
    ******** ERROR: Server received #715, but last was #270!
    toto.nim(63) toto
    .choosenim/toolchains/nim-#devel/lib/pure/asyncdispatch.nim(1932) waitFor
    .choosenim/toolchains/nim-#devel/lib/pure/asyncdispatch.nim(1614) poll
    .choosenim/toolchains/nim-#devel/lib/pure/asyncdispatch.nim(1360) runOnce
    .choosenim/toolchains/nim-#devel/lib/pure/asyncdispatch.nim(208) 
processPendingCallbacks
    .choosenim/toolchains/nim-#devel/lib/pure/asyncmacro.nim(23) 
runServerNimAsyncContinue
    toto.nim(25) runServerIter
    .choosenim/toolchains/nim-#devel/lib/system/assertions.nim(29) 
failedAssertImpl
    .choosenim/toolchains/nim-#devel/lib/system/assertions.nim(22) raiseAssert
    .choosenim/toolchains/nim-#devel/lib/system/fatal.nim(49) sysFatal
    [[reraised from:
    toto.nim(63) toto
    .choosenim/toolchains/nim-#devel/lib/pure/asyncdispatch.nim(1932) waitFor
    .choosenim/toolchains/nim-#devel/lib/pure/asyncdispatch.nim(1614) poll
    .choosenim/toolchains/nim-#devel/lib/pure/asyncdispatch.nim(1360) runOnce
    .choosenim/toolchains/nim-#devel/lib/pure/asyncdispatch.nim(208) 
processPendingCallbacks
    .choosenim/toolchains/nim-#devel/lib/pure/asyncfutures.nim(431) 
asyncCheckCallback
    ]]
    Error: unhandled exception: toto.nim(25, 16) `n == lastN + 1`
    Async traceback:
      toto.nim(63)                                                      toto
      .choosenim/toolchains/nim-#devel/lib/pure/asyncdispatch.nim(1932) waitFor
      .choosenim/toolchains/nim-#devel/lib/pure/asyncdispatch.nim(1614) poll
      .choosenim/toolchains/nim-#devel/lib/pure/asyncdispatch.nim(1360) runOnce
      .choosenim/toolchains/nim-#devel/lib/pure/asyncdispatch.nim(208)  
processPendingCallbacks
      .choosenim/toolchains/nim-#devel/lib/pure/asyncmacro.nim(23)      
runServerNimAsyncContinue
      toto.nim(25)                                                      
runServerIter
      .choosenim/toolchains/nim-#devel/lib/system/assertions.nim(29)    
failedAssertImpl
      .choosenim/toolchains/nim-#devel/lib/system/assertions.nim(22)    
raiseAssert
      .choosenim/toolchains/nim-#devel/lib/system/fatal.nim(49)         sysFatal
    Exception message: toto.nim(25, 16) `n == lastN + 1`
    Exception type: [AssertionDefect]
    Error: execution of an external program failed: 'toto '
    
    
    Run