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Previously we used punycode's toASCII and toUnicode exports, which implement incomplete parts of TR46 themselves (with buggy "is ASCII" checks until recently; see #5 and mathiasbynens/punycode.js#59. Now we usethe lower-level encode and decode exports, with appropriate tweaks to the surrounding code to more fully conform to the surrounding TR46 algorithm steps.
Fixes #5.
Still 488 failing tests before and after. However this improves jsdom/whatwg-url results on the host parser tests at web-platform-tests/wpt#4504 to only 3 failures none of which seem tr46 related.