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    >>> def bprint(s):
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    >>> ellipsis = b'+++'
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    >>> encoding.encoding = b'utf-8'
    >>> t = b'1234567890'
    >>> bprint(trim(t, 12, ellipsis=ellipsis))
    1234567890
    >>> bprint(trim(t, 10, ellipsis=ellipsis))
    1234567890
    >>> bprint(trim(t, 8, ellipsis=ellipsis))
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    >>> bprint(trim(t, 12, ellipsis=ellipsis))
    あいうえお
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    あいうえお
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    あい+++
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    +++えお
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    あい
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    えお
    >>> bprint(trim(t, 4, ellipsis=ellipsis))
    +++
    >>> bprint(trim(t, 4, ellipsis=ellipsis, leftside=True))
    +++
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    >>> bprint(trim(t, 12, ellipsis=ellipsis))
    "3DUfwˆ™ª
    >>> bprint(trim(t, 10, ellipsis=ellipsis))
    "3DUfwˆ™ª
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    - valid UTF-8/ASCII strings are passed as-is
    - other strings are converted to UTF-8b surrogate encoding
    - apply JSON-specified string escaping

    (escapes are doubled in these tests)

    >>> jsonescape(b'this is a test')
    'this is a test'
    >>> jsonescape(b'escape characters: \0 \x0b \x7f')
    'escape characters: \\u0000 \\u000b \\u007f'
    >>> jsonescape(b'escape characters: \b \t \n \f \r \" \\')
    'escape characters: \\b \\t \\n \\f \\r \\" \\\\'
    >>> jsonescape(b'a weird byte: \xdd')
    'a weird byte: \xed\xb3\x9d'
    >>> jsonescape(b'utf-8: caf\xc3\xa9')
    'utf-8: caf\xc3\xa9'
    >>> jsonescape(b'')
    ''

    If paranoid, non-ascii and common troublesome characters are also escaped.
    This is suitable for web output.

    >>> s = b'escape characters: \0 \x0b \x7f'
    >>> assert jsonescape(s) == jsonescape(s, paranoid=True)
    >>> s = b'escape characters: \b \t \n \f \r \" \\'
    >>> assert jsonescape(s) == jsonescape(s, paranoid=True)
    >>> jsonescape(b'escape boundary: \x7e \x7f \xc2\x80', paranoid=True)
    'escape boundary: ~ \\u007f \\u0080'
    >>> jsonescape(b'a weird byte: \xdd', paranoid=True)
    'a weird byte: \\udcdd'
    >>> jsonescape(b'utf-8: caf\xc3\xa9', paranoid=True)
    'utf-8: caf\\u00e9'
    >>> jsonescape(b'non-BMP: \xf0\x9d\x84\x9e', paranoid=True)
    'non-BMP: \\ud834\\udd1e'
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    If a string is already valid UTF-8 (or ASCII), it passes unmodified.
    Otherwise, unsupported bytes are mapped to UTF-16 surrogate range,
    uDC00-uDCFF.

    Principles of operation:

    - ASCII and UTF-8 data successfully round-trips and is understood
      by Unicode-oriented clients
    - filenames and file contents in arbitrary other encodings can have
      be round-tripped or recovered by clueful clients
    - local strings that have a cached known UTF-8 encoding (aka
      localstr) get sent as UTF-8 so Unicode-oriented clients get the
      Unicode data they want
    - non-lossy local strings (aka safelocalstr) get sent as UTF-8 as well
    - because we must preserve UTF-8 bytestring in places such as
      filenames, metadata can't be roundtripped without help

    (Note: "UTF-8b" often refers to decoding a mix of valid UTF-8 and
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    re-encoded back into the original. Here we are exposing the
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    >>> roundtrip = lambda x: fromutf8b(toutf8b(x)) == x
    >>> m = b"\xc3\xa9\x99abcd"
    >>> toutf8b(m)
    '\xc3\xa9\xed\xb2\x99abcd'
    >>> roundtrip(m)
    True
    >>> roundtrip(b"\xc2\xc2\x80")
    True
    >>> roundtrip(b"\xef\xbf\xbd")
    True
    >>> roundtrip(b"\xef\xef\xbf\xbd")
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