Delivering complex objects to the remote fails if the remote cannot unpickle them

[pilcru]

For example, trying to deliver a (remote) numpy array. Probably this does not even make sense: we shouldn't deliver something that is already on the remote. Similarly, sending b"a" from IronPython 2 to CPython 2 won't work because it represents a call to bytes(u'a', 'latin-1') in IronPython, that CPython has no chance of understanding since bytes == str, which only takes one argument (no encoding).

But maybe this might hint at other issues when passing around netrefs or function calls.

>>> np = sc.sticky['numpy']
>>> rpyc.utils.classic.deliver(rpy, np.array(10))

Runtime error (Exception): TypeError
Traceback:
  line 516, in sync_request, "C:\Users\pcuvil.WIN\AppData\Roaming\McNeel\Rhinoceros\5.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\rpyc\core\protocol.py"
  line 78, in syncreq, "C:\Users\pcuvil.WIN\AppData\Roaming\McNeel\Rhinoceros\5.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\rpyc\core\netref.py"
  line 212, in __call__, "C:\Users\pcuvil.WIN\AppData\Roaming\McNeel\Rhinoceros\5.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\rpyc\core\netref.py"
  line 292, in deliver, "C:\Users\pcuvil.WIN\AppData\Roaming\McNeel\Rhinoceros\5.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\rpyc\utils\classic.py"
  line 58, in script

--- Remote traceback: ---
Exception caught
Traceback (most recent call last):
  File "c:\tools\anaconda3\envs\rhinoremote\lib\site-packages\rpyc\core\protocol.py", line 342, in _dispatch_request
    res = self._HANDLERS[handler](self, *args)
  File "c:\tools\anaconda3\envs\rhinoremote\lib\site-packages\rpyc\core\protocol.py", line 638, in _handle_call
    return obj(*args, **dict(kwargs))
TypeError: ('loads() argument 1 must be string, not unicode', <built-in function loads>, (u"cnumpy.core.multiarray\n_rec
onstruct\np1\n(cnumpy\nndarray\np2\n(I0\ntS'b'\ntRp3\n(I1\n(tcnumpy\ndtype\np4\n(S'i4'\nI0\nI1\ntRp5\n(I3\nS'<'\nNNNI-1\
nI-1\nI0\ntbI00\nS'\\n\\x00\\x00\\x00'\ntb.",))

>>> rpyc.utils.classic.deliver(rpy, b"a")
(Same local traceback)

--- Remote traceback ---
Exception caught
Traceback (most recent call last):
  File "c:\tools\anaconda3\envs\rhinoremote\lib\site-packages\rpyc\core\protocol.py", line 342, in _dispatch_request
    res = self._HANDLERS[handler](self, *args)
  File "c:\tools\anaconda3\envs\rhinoremote\lib\site-packages\rpyc\core\protocol.py", line 638, in _handle_call
    return obj(*args, **dict(kwargs))
TypeError: ('str() takes at most 1 argument (2 given)', <type 'str'>, (u's', u'latin-1'))

Forcing casting to bytes in rpyc.utils.classic.obtain or rpyc.core.netref.__array__ doesn't fix it.