New submission from Madison May:
Currently the json lib only logs the string representation of the variable,
which does not always include type information.
I recently ran into a difficult to debug issue with code similar to the
following:
```
import json
import numpy as np
d = {'data': np.int16(5)}
json.dumps(d)
```
which produces the following error:
```
TypeError: 5 is not JSON serializable
```
It took us quite a while to determine that `5` was actually of type `np.int`
instead of the native type.
A cursory glance at StackOverflow suggests that I'm not alone in running into
this issue:
http://stackoverflow.com/questions/10872604/json-dump-throwing-typeerror-is-not-json-serializable-on-seemingly-vali
I'd like to consider modifying the error message to be more similar to the
following:
```
TypeError: 5 of type `numpy.int16` is not JSON serializable
```
----------
components: Library (Lib)
messages: 246776
nosy: Madison May
priority: normal
severity: normal
status: open
title: Log type of unserializable value when raising JSON TypeError
versions: Python 2.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue24641>
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