JSON parser test failures

[lod]

A JSON test suite has been produced which tests most commonly available JSON parsers against JSON corner cases
http://seriot.ch/parsing_json.php
https://github.com/nst/JSONTestSuite

These two test files are reported as causing the parser to crash.
https://github.com/nst/JSONTestSuite/blob/master/test_parsing/n_structure_100000_opening_arrays.json
https://github.com/nst/JSONTestSuite/blob/master/test_parsing/n_structure_open_array_object.json

These two test files are reported as being incorrectly parsed.
https://github.com/nst/JSONTestSuite/blob/master/test_parsing/y_object_escaped_null_in_key.json
https://github.com/nst/JSONTestSuite/blob/master/test_parsing/y_string_null_escape.json

I have not yet personally tested any of the tests.

[lod]

The two test files reported as incorrectly parsed are due to the presence of null characters.

Not supporting these seems to be a deliberate decision, presumably as doing otherwise would interfere with the standard string structure and be a pain to manage and use.

Explicitly documenting this variation from the standard would probably be worthwhile however.