TypeError: can't serialize np.float32(1213771) or np.int64(1213771)

[dragoljub]

I found these strange corner cases when serializing np.float32 and np.int64 values. What's strange is that np.int32 and np.float64 for the same underlying value works.

Any ideas whats going on? ❓

import msgpack
import numpy as np

In [1]: np.__version__

Out[1]: '1.9.2'

In [2]: msgpack.version

Out[2]: (0, 4, 6)

In [3]: msgpack.packb([np.float32(1213771)])

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-3-a34bd885d43f> in <module>()
----> 1 msgpack.packb([np.float32(1213771)])

D:\Python27\lib\site-packages\msgpack\__init__.pyc in packb(o, **kwargs)
     45     See :class:`Packer` for options.
     46     """
---> 47     return Packer(**kwargs).pack(o)
     48 
     49 # alias for compatibility to simplejson/marshal/pickle.

msgpack\_packer.pyx in msgpack._packer.Packer.pack (msgpack\_packer.cpp:223)()

msgpack\_packer.pyx in msgpack._packer.Packer.pack (msgpack\_packer.cpp:225)()

msgpack\_packer.pyx in msgpack._packer.Packer._pack (msgpack\_packer.cpp:213)()

msgpack\_packer.pyx in msgpack._packer.Packer._pack (msgpack\_packer.cpp:220)()

TypeError: can't serialize 1213771.0

In [4]: msgpack.packb([np.int64(1213771)])

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-4-dc4780e7a01d> in <module>()
----> 1 msgpack.packb([np.int64(1213771)])

D:\Python27\lib\site-packages\msgpack\__init__.pyc in packb(o, **kwargs)
     45     See :class:`Packer` for options.
     46     """
---> 47     return Packer(**kwargs).pack(o)
     48 
     49 # alias for compatibility to simplejson/marshal/pickle.

msgpack\_packer.pyx in msgpack._packer.Packer.pack (msgpack\_packer.cpp:223)()

msgpack\_packer.pyx in msgpack._packer.Packer.pack (msgpack\_packer.cpp:225)()

msgpack\_packer.pyx in msgpack._packer.Packer._pack (msgpack\_packer.cpp:213)()

msgpack\_packer.pyx in msgpack._packer.Packer._pack (msgpack\_packer.cpp:220)()

TypeError: can't serialize 1213771

In [5]: msgpack.packb([np.int32(1213771)])

Out[5]: '\x91\xce\x00\x12\x85K'

In [6]: msgpack.packb([np.float64(1213771)])

Out[6]: '\x91\xcbA2\x85K\x00\x00\x00\x00'

[methane]

See #61.