Fix small JSON bugs, bring in test suite

Just decided to "harden" the JSON parser a little bit with the test
suite from https://github.com/nst/JSONTestSuite. Now I'm pretty sure
that we can handle whatever JSON docker throws at us.

resources/json/README.md

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+# Test JSON
+
+This directory contains test JSON files from https://github.com/nst/JSONTestSuite as of commit 984defc.
+
+It only has the positive and questionable JSON inputs, as our JSON parser is extremely forgiving, by design.
+
+## Filtered tests
+
+Some of the questionable tests have been removed:
+
+- `i_structure_UTF-8_BOM_empty_object.json` removed because we don't handle BOMs.
+- `i_string_utf16LE_no_BOM.json` removed because we don't speak UTF16.
+- `i_string_utf16BE_no_BOM.json` removed because we don't speak UTF16.
+- `i_string_UTF-16LE_with_BOM.json` removed because we don't speak UTF16.

resources/json/i_number_double_huge_neg_exp.json

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+[123.456e-789]

resources/json/i_number_huge_exp.json

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+[0.4e00669999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999969999999006]

resources/json/i_number_neg_int_huge_exp.json

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+[-1e+9999]

resources/json/i_number_pos_double_huge_exp.json

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+[1.5e+9999]

resources/json/i_number_real_neg_overflow.json

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+[-123123e100000]

resources/json/i_number_real_pos_overflow.json

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+[123123e100000]

resources/json/i_number_real_underflow.json

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+[123e-10000000]

resources/json/i_number_too_big_neg_int.json

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+[-123123123123123123123123123123]

resources/json/i_number_too_big_pos_int.json

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+[100000000000000000000]

resources/json/i_number_very_big_negative_int.json

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+[-237462374673276894279832749832423479823246327846]

resources/json/i_object_key_lone_2nd_surrogate.json

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+{"\uDFAA":0}

resources/json/i_string_1st_surrogate_but_2nd_missing.json

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+["\uDADA"]

resources/json/i_string_1st_valid_surrogate_2nd_invalid.json

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+["\uD888\u1234"]

resources/json/i_string_UTF-8_invalid_sequence.json

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+["譌･ﾑ淫"]

resources/json/i_string_UTF8_surrogate_U+D800.json

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+["<22><><EFBFBD>"]

resources/json/i_string_incomplete_surrogate_and_escape_valid.json

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+["\uD800\n"]

resources/json/i_string_incomplete_surrogate_pair.json

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+["\uDd1ea"]

resources/json/i_string_incomplete_surrogates_escape_valid.json

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+["\uD800\uD800\n"]

resources/json/i_string_invalid_lonely_surrogate.json

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+["\ud800"]

resources/json/i_string_invalid_surrogate.json

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+["\ud800abc"]

resources/json/i_string_invalid_utf-8.json

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+["<22>"]

resources/json/i_string_inverted_surrogates_U+1D11E.json

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+["\uDd1e\uD834"]

resources/json/i_string_iso_latin_1.json

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+["И"]

resources/json/i_string_lone_second_surrogate.json

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+["\uDFAA"]

resources/json/i_string_lone_utf8_continuation_byte.json

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+["<22>"]

resources/json/i_string_not_in_unicode_range.json

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+["<22><><EFBFBD><EFBFBD>"]

resources/json/i_string_overlong_sequence_2_bytes.json

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+["<22><>"]

resources/json/i_string_overlong_sequence_6_bytes.json

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+["<22>ｿｿｿｿ"]

resources/json/i_string_overlong_sequence_6_bytes_null.json

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+["<22>€€€€"]

resources/json/i_string_truncated-utf-8.json

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+["<22><>"]

resources/json/i_structure_500_nested_arrays.json

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+[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]

resources/json/y_array_arraysWithSpaces.json

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+[[]   ]

resources/json/y_array_empty-string.json

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+[""]

resources/json/y_array_empty.json

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+[]

resources/json/y_array_ending_with_newline.json

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+["a"]

resources/json/y_array_false.json

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+[false]

resources/json/y_array_heterogeneous.json

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+[null, 1, "1", {}]

resources/json/y_array_null.json

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+[null]

resources/json/y_array_with_1_and_newline.json

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+[1
+]

resources/json/y_array_with_leading_space.json

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+ [1]

resources/json/y_array_with_several_null.json

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+[1,null,null,null,2]

resources/json/y_array_with_trailing_space.json

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+[2] 

resources/json/y_number.json

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+[123e65]

resources/json/y_number_0e+1.json

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+[0e+1]

resources/json/y_number_0e1.json

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+[0e1]

resources/json/y_number_after_space.json

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+[ 4]

resources/json/y_number_double_close_to_zero.json

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+[-0.000000000000000000000000000000000000000000000000000000000000000000000000000001]

resources/json/y_number_int_with_exp.json

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+[20e1]

resources/json/y_number_minus_zero.json

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+[-0]

resources/json/y_number_negative_int.json

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+[-123]

resources/json/y_number_negative_one.json

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+[-1]

resources/json/y_number_negative_zero.json

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+[-0]

resources/json/y_number_real_capital_e.json

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+[1E22]

resources/json/y_number_real_capital_e_neg_exp.json

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+[1E-2]

resources/json/y_number_real_capital_e_pos_exp.json

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+[1E+2]

resources/json/y_number_real_exponent.json

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+[123e45]

resources/json/y_number_real_fraction_exponent.json

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+[123.456e78]

resources/json/y_number_real_neg_exp.json

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+[1e-2]

resources/json/y_number_real_pos_exponent.json

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+[1e+2]

resources/json/y_number_simple_int.json

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+[123]

resources/json/y_number_simple_real.json

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+[123.456789]

resources/json/y_object.json

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+{"asd":"sdf", "dfg":"fgh"}

resources/json/y_object_basic.json

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+{"asd":"sdf"}

resources/json/y_object_duplicated_key.json

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+{"a":"b","a":"c"}

resources/json/y_object_duplicated_key_and_value.json

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+{"a":"b","a":"b"}

resources/json/y_object_empty.json

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+{}

resources/json/y_object_empty_key.json

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+{"":0}

resources/json/y_object_escaped_null_in_key.json

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+{"foo\u0000bar": 42}

resources/json/y_object_extreme_numbers.json

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+{ "min": -1.0e+28, "max": 1.0e+28 }

resources/json/y_object_long_strings.json

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+{"x":[{"id": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"}], "id": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"}

resources/json/y_object_simple.json

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+{"a":[]}

resources/json/y_object_string_unicode.json

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+{"title":"\u041f\u043e\u043b\u0442\u043e\u0440\u0430 \u0417\u0435\u043c\u043b\u0435\u043a\u043e\u043f\u0430" }

resources/json/y_object_with_newlines.json

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+{
+"a": "b"
+}

resources/json/y_string_1_2_3_bytes_UTF-8_sequences.json

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+["\u0060\u012a\u12AB"]

resources/json/y_string_accepted_surrogate_pair.json

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+["\uD801\udc37"]

resources/json/y_string_accepted_surrogate_pairs.json

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+["\ud83d\ude39\ud83d\udc8d"]

resources/json/y_string_allowed_escapes.json

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+["\"\\\/\b\f\n\r\t"]

resources/json/y_string_backslash_and_u_escaped_zero.json

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+["\\u0000"]

resources/json/y_string_backslash_doublequotes.json

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+["\""]

resources/json/y_string_comments.json

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+["a/*b*/c/*d//e"]

resources/json/y_string_double_escape_a.json

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+["\\a"]

resources/json/y_string_double_escape_n.json

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+["\\n"]

resources/json/y_string_escaped_control_character.json

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+["\u0012"]

resources/json/y_string_escaped_noncharacter.json

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+["\uFFFF"]

resources/json/y_string_in_array.json

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+["asd"]

resources/json/y_string_in_array_with_leading_space.json

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+[ "asd"]

resources/json/y_string_last_surrogates_1_and_2.json

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+["\uDBFF\uDFFF"]

resources/json/y_string_nbsp_uescaped.json

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+["new\u00A0line"]

resources/json/y_string_nonCharacterInUTF-8_U+10FFFF.json

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+["􏿿"]

resources/json/y_string_nonCharacterInUTF-8_U+FFFF.json

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+["￿"]

resources/json/y_string_null_escape.json

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+["\u0000"]

resources/json/y_string_one-byte-utf-8.json

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+["\u002c"]

resources/json/y_string_pi.json

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+["π"]

resources/json/y_string_reservedCharacterInUTF-8_U+1BFFF.json

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+["𛿿"]

resources/json/y_string_simple_ascii.json

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+["asd "]

resources/json/y_string_space.json

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+" "

resources/json/y_string_surrogates_U+1D11E_MUSICAL_SYMBOL_G_CLEF.json

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+["\uD834\uDd1e"]

resources/json/y_string_three-byte-utf-8.json

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+["\u0821"]

resources/json/y_string_two-byte-utf-8.json

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+["\u0123"]