RustPython
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+r"""JSON (JavaScript Object Notation) <http://json.org> is a subset of
+JavaScript syntax (ECMA-262 3rd edition) used as a lightweight data
+interchange format.
+
+:mod:`json` exposes an API familiar to users of the standard library
+:mod:`marshal` and :mod:`pickle` modules.  It is derived from a
+version of the externally maintained simplejson library.
+
+Encoding basic Python object hierarchies::
+
+    >>> import json
+    >>> json.dumps(['foo', {'bar': ('baz', None, 1.0, 2)}])
+    '["foo", {"bar": ["baz", null, 1.0, 2]}]'
+    >>> print(json.dumps("\"foo\bar"))
+    "\"foo\bar"
+    >>> print(json.dumps('\u1234'))
+    "\u1234"
+    >>> print(json.dumps('\\'))
+    "\\"
+    >>> print(json.dumps({"c": 0, "b": 0, "a": 0}, sort_keys=True))
+    {"a": 0, "b": 0, "c": 0}
+    >>> from io import StringIO
+    >>> io = StringIO()
+    >>> json.dump(['streaming API'], io)
+    >>> io.getvalue()
+    '["streaming API"]'
+
+Compact encoding::
+
+    >>> import json
+    >>> mydict = {'4': 5, '6': 7}
+    >>> json.dumps([1,2,3,mydict], separators=(',', ':'))
+    '[1,2,3,{"4":5,"6":7}]'
+
+Pretty printing::
+
+    >>> import json
+    >>> print(json.dumps({'4': 5, '6': 7}, sort_keys=True, indent=4))
+    {
+        "4": 5,
+        "6": 7
+    }
+
+Decoding JSON::
+
+    >>> import json
+    >>> obj = ['foo', {'bar': ['baz', None, 1.0, 2]}]
+    >>> json.loads('["foo", {"bar":["baz", null, 1.0, 2]}]') == obj
+    True
+    >>> json.loads('"\\"foo\\bar"') == '"foo\x08ar'
+    True
+    >>> from io import StringIO
+    >>> io = StringIO('["streaming API"]')
+    >>> json.load(io)[0] == 'streaming API'
+    True
+
+Specializing JSON object decoding::
+
+    >>> import json
+    >>> def as_complex(dct):
+    ...     if '__complex__' in dct:
+    ...         return complex(dct['real'], dct['imag'])
+    ...     return dct
+    ...
+    >>> json.loads('{"__complex__": true, "real": 1, "imag": 2}',
+    ...     object_hook=as_complex)
+    (1+2j)
+    >>> from decimal import Decimal
+    >>> json.loads('1.1', parse_float=Decimal) == Decimal('1.1')
+    True
+
+Specializing JSON object encoding::
+
+    >>> import json
+    >>> def encode_complex(obj):
+    ...     if isinstance(obj, complex):
+    ...         return [obj.real, obj.imag]
+    ...     raise TypeError(f'Object of type {obj.__class__.__name__} '
+    ...                     f'is not JSON serializable')
+    ...
+    >>> json.dumps(2 + 1j, default=encode_complex)
+    '[2.0, 1.0]'
+    >>> json.JSONEncoder(default=encode_complex).encode(2 + 1j)
+    '[2.0, 1.0]'
+    >>> ''.join(json.JSONEncoder(default=encode_complex).iterencode(2 + 1j))
+    '[2.0, 1.0]'
+
+
+Using json.tool from the shell to validate and pretty-print::
+
+    $ echo '{"json":"obj"}' | python -m json.tool
+    {
+        "json": "obj"
+    }
+    $ echo '{ 1.2:3.4}' | python -m json.tool
+    Expecting property name enclosed in double quotes: line 1 column 3 (char 2)
+"""
+__version__ = '2.0.9'
+__all__ = [
+    'dump', 'dumps', 'load', 'loads',
+    'JSONDecoder', 'JSONDecodeError', 'JSONEncoder',
+]
+
+__author__ = 'Bob Ippolito <bob@redivi.com>'
+
+from .decoder import JSONDecoder, JSONDecodeError
+from .encoder import JSONEncoder
+import codecs
+
+_default_encoder = JSONEncoder(
+    skipkeys=False,
+    ensure_ascii=True,
+    check_circular=True,
+    allow_nan=True,
+    indent=None,
+    separators=None,
+    default=None,
+)
+
+def dump(obj, fp, *, skipkeys=False, ensure_ascii=True, check_circular=True,
+        allow_nan=True, cls=None, indent=None, separators=None,
+        default=None, sort_keys=False, **kw):
+    """Serialize ``obj`` as a JSON formatted stream to ``fp`` (a
+    ``.write()``-supporting file-like object).
+
+    If ``skipkeys`` is true then ``dict`` keys that are not basic types
+    (``str``, ``int``, ``float``, ``bool``, ``None``) will be skipped
+    instead of raising a ``TypeError``.
+
+    If ``ensure_ascii`` is false, then the strings written to ``fp`` can
+    contain non-ASCII characters if they appear in strings contained in
+    ``obj``. Otherwise, all such characters are escaped in JSON strings.
+
+    If ``check_circular`` is false, then the circular reference check
+    for container types will be skipped and a circular reference will
+    result in an ``OverflowError`` (or worse).
+
+    If ``allow_nan`` is false, then it will be a ``ValueError`` to
+    serialize out of range ``float`` values (``nan``, ``inf``, ``-inf``)
+    in strict compliance of the JSON specification, instead of using the
+    JavaScript equivalents (``NaN``, ``Infinity``, ``-Infinity``).
+
+    If ``indent`` is a non-negative integer, then JSON array elements and
+    object members will be pretty-printed with that indent level. An indent
+    level of 0 will only insert newlines. ``None`` is the most compact
+    representation.
+
+    If specified, ``separators`` should be an ``(item_separator, key_separator)``
+    tuple.  The default is ``(', ', ': ')`` if *indent* is ``None`` and
+    ``(',', ': ')`` otherwise.  To get the most compact JSON representation,
+    you should specify ``(',', ':')`` to eliminate whitespace.
+
+    ``default(obj)`` is a function that should return a serializable version
+    of obj or raise TypeError. The default simply raises TypeError.
+
+    If *sort_keys* is true (default: ``False``), then the output of
+    dictionaries will be sorted by key.
+
+    To use a custom ``JSONEncoder`` subclass (e.g. one that overrides the
+    ``.default()`` method to serialize additional types), specify it with
+    the ``cls`` kwarg; otherwise ``JSONEncoder`` is used.
+
+    """
+    # cached encoder
+    if (not skipkeys and ensure_ascii and
+        check_circular and allow_nan and
+        cls is None and indent is None and separators is None and
+        default is None and not sort_keys and not kw):
+        iterable = _default_encoder.iterencode(obj)
+    else:
+        if cls is None:
+            cls = JSONEncoder
+        iterable = cls(skipkeys=skipkeys, ensure_ascii=ensure_ascii,
+            check_circular=check_circular, allow_nan=allow_nan, indent=indent,
+            separators=separators,
+            default=default, sort_keys=sort_keys, **kw).iterencode(obj)
+    # could accelerate with writelines in some versions of Python, at
+    # a debuggability cost
+    for chunk in iterable:
+        fp.write(chunk)
+
+
+def dumps(obj, *, skipkeys=False, ensure_ascii=True, check_circular=True,
+        allow_nan=True, cls=None, indent=None, separators=None,
+        default=None, sort_keys=False, **kw):
+    """Serialize ``obj`` to a JSON formatted ``str``.
+
+    If ``skipkeys`` is true then ``dict`` keys that are not basic types
+    (``str``, ``int``, ``float``, ``bool``, ``None``) will be skipped
+    instead of raising a ``TypeError``.
+
+    If ``ensure_ascii`` is false, then the return value can contain non-ASCII
+    characters if they appear in strings contained in ``obj``. Otherwise, all
+    such characters are escaped in JSON strings.
+
+    If ``check_circular`` is false, then the circular reference check
+    for container types will be skipped and a circular reference will
+    result in an ``OverflowError`` (or worse).
+
+    If ``allow_nan`` is false, then it will be a ``ValueError`` to
+    serialize out of range ``float`` values (``nan``, ``inf``, ``-inf``) in
+    strict compliance of the JSON specification, instead of using the
+    JavaScript equivalents (``NaN``, ``Infinity``, ``-Infinity``).
+
+    If ``indent`` is a non-negative integer, then JSON array elements and
+    object members will be pretty-printed with that indent level. An indent
+    level of 0 will only insert newlines. ``None`` is the most compact
+    representation.
+
+    If specified, ``separators`` should be an ``(item_separator, key_separator)``
+    tuple.  The default is ``(', ', ': ')`` if *indent* is ``None`` and
+    ``(',', ': ')`` otherwise.  To get the most compact JSON representation,
+    you should specify ``(',', ':')`` to eliminate whitespace.
+
+    ``default(obj)`` is a function that should return a serializable version
+    of obj or raise TypeError. The default simply raises TypeError.
+
+    If *sort_keys* is true (default: ``False``), then the output of
+    dictionaries will be sorted by key.
+
+    To use a custom ``JSONEncoder`` subclass (e.g. one that overrides the
+    ``.default()`` method to serialize additional types), specify it with
+    the ``cls`` kwarg; otherwise ``JSONEncoder`` is used.
+
+    """
+    # cached encoder
+    if (not skipkeys and ensure_ascii and
+        check_circular and allow_nan and
+        cls is None and indent is None and separators is None and
+        default is None and not sort_keys and not kw):
+        return _default_encoder.encode(obj)
+    if cls is None:
+        cls = JSONEncoder
+    return cls(
+        skipkeys=skipkeys, ensure_ascii=ensure_ascii,
+        check_circular=check_circular, allow_nan=allow_nan, indent=indent,
+        separators=separators, default=default, sort_keys=sort_keys,
+        **kw).encode(obj)
+
+
+_default_decoder = JSONDecoder(object_hook=None, object_pairs_hook=None)
+
+
+def detect_encoding(b):
+    bstartswith = b.startswith
+    if bstartswith((codecs.BOM_UTF32_BE, codecs.BOM_UTF32_LE)):
+        return 'utf-32'
+    if bstartswith((codecs.BOM_UTF16_BE, codecs.BOM_UTF16_LE)):
+        return 'utf-16'
+    if bstartswith(codecs.BOM_UTF8):
+        return 'utf-8-sig'
+
+    if len(b) >= 4:
+        if not b[0]:
+            # 00 00 -- -- - utf-32-be
+            # 00 XX -- -- - utf-16-be
+            return 'utf-16-be' if b[1] else 'utf-32-be'
+        if not b[1]:
+            # XX 00 00 00 - utf-32-le
+            # XX 00 00 XX - utf-16-le
+            # XX 00 XX -- - utf-16-le
+            return 'utf-16-le' if b[2] or b[3] else 'utf-32-le'
+    elif len(b) == 2:
+        if not b[0]:
+            # 00 XX - utf-16-be
+            return 'utf-16-be'
+        if not b[1]:
+            # XX 00 - utf-16-le
+            return 'utf-16-le'
+    # default
+    return 'utf-8'
+
+
+def load(fp, *, cls=None, object_hook=None, parse_float=None,
+        parse_int=None, parse_constant=None, object_pairs_hook=None, **kw):
+    """Deserialize ``fp`` (a ``.read()``-supporting file-like object containing
+    a JSON document) to a Python object.
+
+    ``object_hook`` is an optional function that will be called with the
+    result of any object literal decode (a ``dict``). The return value of
+    ``object_hook`` will be used instead of the ``dict``. This feature
+    can be used to implement custom decoders (e.g. JSON-RPC class hinting).
+
+    ``object_pairs_hook`` is an optional function that will be called with the
+    result of any object literal decoded with an ordered list of pairs.  The
+    return value of ``object_pairs_hook`` will be used instead of the ``dict``.
+    This feature can be used to implement custom decoders.  If ``object_hook``
+    is also defined, the ``object_pairs_hook`` takes priority.
+
+    To use a custom ``JSONDecoder`` subclass, specify it with the ``cls``
+    kwarg; otherwise ``JSONDecoder`` is used.
+    """
+    return loads(fp.read(),
+        cls=cls, object_hook=object_hook,
+        parse_float=parse_float, parse_int=parse_int,
+        parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)
+
+
+def loads(s, *, cls=None, object_hook=None, parse_float=None,
+        parse_int=None, parse_constant=None, object_pairs_hook=None, **kw):
+    """Deserialize ``s`` (a ``str``, ``bytes`` or ``bytearray`` instance
+    containing a JSON document) to a Python object.
+
+    ``object_hook`` is an optional function that will be called with the
+    result of any object literal decode (a ``dict``). The return value of
+    ``object_hook`` will be used instead of the ``dict``. This feature
+    can be used to implement custom decoders (e.g. JSON-RPC class hinting).
+
+    ``object_pairs_hook`` is an optional function that will be called with the
+    result of any object literal decoded with an ordered list of pairs.  The
+    return value of ``object_pairs_hook`` will be used instead of the ``dict``.
+    This feature can be used to implement custom decoders.  If ``object_hook``
+    is also defined, the ``object_pairs_hook`` takes priority.
+
+    ``parse_float``, if specified, will be called with the string
+    of every JSON float to be decoded. By default this is equivalent to
+    float(num_str). This can be used to use another datatype or parser
+    for JSON floats (e.g. decimal.Decimal).
+
+    ``parse_int``, if specified, will be called with the string
+    of every JSON int to be decoded. By default this is equivalent to
+    int(num_str). This can be used to use another datatype or parser
+    for JSON integers (e.g. float).
+
+    ``parse_constant``, if specified, will be called with one of the
+    following strings: -Infinity, Infinity, NaN.
+    This can be used to raise an exception if invalid JSON numbers
+    are encountered.
+
+    To use a custom ``JSONDecoder`` subclass, specify it with the ``cls``
+    kwarg; otherwise ``JSONDecoder`` is used.
+
+    The ``encoding`` argument is ignored and deprecated since Python 3.1.
+    """
+    if isinstance(s, str):
+        if s.startswith('\ufeff'):
+            raise JSONDecodeError("Unexpected UTF-8 BOM (decode using utf-8-sig)",
+                                  s, 0)
+    else:
+        if not isinstance(s, (bytes, bytearray)):
+            raise TypeError(f'the JSON object must be str, bytes or bytearray, '
+                            f'not {s.__class__.__name__}')
+        s = s.decode(detect_encoding(s), 'surrogatepass')
+
+    if "encoding" in kw:
+        import warnings
+        warnings.warn(
+            "'encoding' is ignored and deprecated. It will be removed in Python 3.9",
+            DeprecationWarning,
+            stacklevel=2
+        )
+        del kw['encoding']
+
+    if (cls is None and object_hook is None and
+            parse_int is None and parse_float is None and
+            parse_constant is None and object_pairs_hook is None and not kw):
+        return _default_decoder.decode(s)
+    if cls is None:
+        cls = JSONDecoder
+    if object_hook is not None:
+        kw['object_hook'] = object_hook
+    if object_pairs_hook is not None:
+        kw['object_pairs_hook'] = object_pairs_hook
+    if parse_float is not None:
+        kw['parse_float'] = parse_float
+    if parse_int is not None:
+        kw['parse_int'] = parse_int
+    if parse_constant is not None:
+        kw['parse_constant'] = parse_constant
+    return cls(**kw).decode(s)