Version 2.2.0 (released 2019-05-23)
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Perform A-Label roundtrip for lookup functions by default
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Stricter check of input to punycode decoder
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Fix punycode decoding with no ASCII chars but given delimiter
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Fix 'idn2 --no-tr64' (was a no-op)
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Allow _ as a basic code point in domain labels
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Fail building documentation if 'ronn' isn't installed
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git tag changed to reflect https://semver.org/