OverflowError for string of large numbers (int64) while reading json


```python
import json
import pandas as pd
json_data = {"articleId":"1404366058080022500245"}
pd.read_json(json.dumps(json_data), typ='series')

Python int too large to convert to C long: OverflowError
...
File "/var/task/pandas/io/json/json.py", line 366, in read_json
return json_reader.read()
File "/var/task/pandas/io/json/json.py", line 467, in read
obj = self._get_object_parser(self.data)
File "/var/task/pandas/io/json/json.py", line 489, in _get_object_parser
obj = SeriesParser(json, **kwargs).parse()
File "/var/task/pandas/io/json/json.py", line 582, in parse
self._try_convert_types()
File "/var/task/pandas/io/json/json.py", line 752, in _try_convert_types
'data', self.obj, convert_dates=self.convert_dates)
File "/var/task/pandas/io/json/json.py", line 621, in _try_convert_data
new_data, result = self._try_convert_to_date(data)
File "/var/task/pandas/io/json/json.py", line 684, in _try_convert_to_date
new_data = data.astype('int64')
File "/var/task/pandas/util/_decorators.py", line 118, in wrapper
return func(*args, **kwargs)
File "/var/task/pandas/core/generic.py", line 4004, in astype
**kwargs)
File "/var/task/pandas/core/internals.py", line 3462, in astype
return self.apply('astype', dtype=dtype, **kwargs)
File "/var/task/pandas/core/internals.py", line 3329, in apply
applied = getattr(b, f)(**kwargs)
File "/var/task/pandas/core/internals.py", line 544, in astype
**kwargs)
File "/var/task/pandas/core/internals.py", line 625, in _astype
values = astype_nansafe(values.ravel(), dtype, copy=True)
File "/var/task/pandas/core/dtypes/cast.py", line 692, in astype_nansafe
return lib.astype_intsafe(arr.ravel(), dtype).reshape(arr.shape)
File "pandas/_libs/lib.pyx", line 854, in pandas._libs.lib.astype_intsafe
File "pandas/_libs/src/util.pxd", line 91, in util.set_value_at_unsafe
OverflowError: Python int too large to convert to C long
```

Reading json containing stringified numbers larger than int64 causes OverflowError in pandas 0.21.1. Appears to be working fine in 0.21.0

Max


