gh-144133: Add a warning to encodings.punycode documentation#151812
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StanFromIreland wants to merge 1 commit into
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gh-144133: Add a warning to encodings.punycode documentation#151812StanFromIreland wants to merge 1 commit into
encodings.punycode documentation#151812StanFromIreland wants to merge 1 commit into
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gpshead
approved these changes
Jun 20, 2026
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The RFC's reference algorithms have quadratic complexity, as it was designed only designed to handle the intended (limited) input, as described in Section 6.4. While some implementations have avoided this general complexity by introducing caps (e.g. ICU), that's a little too drastic for us to do. Rewriting the algorithms is complicated, and people have tried before, however they capitulate as in practice, with appropriate limits (the DNS label length limit is 63), this should not cause issues.
CC @kjd @malemburg