dmiller fac667e621 Bugfixes in json.lua ...

A few bugs crept in during the conversion to LPEG parsing:

1. Unicode parsing of UTF-16 surrogate pairs returned an ending position
that was off by 2, so that the last 2 characters in the escape code were
parsed as literal characters.

2. Arrays and objects were not being tagged as such with make_array and
make_object during parsing.

This commit fixes these bugs, and returns to using unicode.utf8_enc for
UTF-8 encoding instead of a separately-defined function. Also, the tests
at the end (which were helpful in finding both of the bugs above) were
converted to unittest.lua tests.

2015-02-28 12:43:43 +00:00

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