Noteworthy changes in release 2.3.1 (2021-05-12) [stable]
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Implement full roundtrip for lookup functionality With TR64 enabled (default), '<9C>i' was converted to 'xn-- o-oia59s'. The output contains an illegal space and thus could not be decoded any more. Reported-by: Chris Malton. See #78 and https://gitlab.isc.org/isc-projects/bind9/issues/1610.
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Fix domain too long error
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doc: idn2.1 and libidn2.texi automatically get idn2 --help output.
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Updated gnulib files and various build fixes. In particular, it no longer attempts to detect a host CC compiler. See #83.