When an error occurs better diagnostics should be displayed

[twekberg]

What did you do?

I used ujson.load to load a file. It generated this message:
ValueError: Value is too big!
because one of the values was an integer that had 388 6's (i.e. 666666...).

What did you expect to happen?

It would be nice to have the diagnostic displayed with the character or line number in the file where the error was detected.

What actually happened?

Only an 'I got an error somewhere' type of a diagnostic.
It took several hours to determine where the problem was. The file size was 6.3MB.

What versions are you using?

• OS: Ubuntu 20.04
• Python: 3.8.10
• UltraJSON: 5.1.0

Please include code that reproduces the issue.

>>> import ujson
>>> print(ujson.__version__)
5.1.0
>>> t='[,]'
>>> ujson.loads(t)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: Expected object or value

The same diagnostic is generated for ujson 5.7.0.

[bwoodsend]

Character numbers should be fairly doable.

[bwoodsend]

That said, a dumb grep -P '\d{100,}' file.json would have found the issue instantly.