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Shared interface to IDNA encoding and decoding, using the C{idna} PyPI package
if available, otherwise the stdlib implementation.
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    Convert some text typed by a human into some ASCII bytes.

    This is provided to allow us to use the U{partially-broken IDNA
    implementation in the standard library <http://bugs.python.org/issue17305>}
    if the more-correct U{idna <https://pypi.python.org/pypi/idna>} package is
    not available; C{service_identity} is somewhat stricter about this.

    @param text: A domain name, hopefully.
    @type text: L{unicode}

    @return: The domain name's IDNA representation, encoded as bytes.
    @rtype: L{bytes}
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    Convert some IDNA-encoded octets into some human-readable text.

    Currently only used by the tests.

    @param octets: Some bytes representing a hostname.
    @type octets: L{bytes}

    @return: A human-readable domain name.
    @rtype: L{unicode}
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