OK /encoding/legacy-mb-tchinese/big5/big5-encode-form-errors-hangul.html?1-1000
  │   ▶ FAIL [expected PASS] hangul U+AD90 \uad90 %26%2344432%3B
  │   │   → assert_equals: expected "%26%2344432%3B" but got ""
  │   │ FAIL [expected PASS] hangul U+AD91 \uad91 %26%2344433%3B
  │   │   → assert_equals: expected (string) "%26%2344433%3B" but got (undefined) undefined
  │   │ FAIL [expected PASS] hangul U+AD92 \uad92 %26%2344434%3B
  │   │   → assert_equals: expected (string) "%26%2344434%3B" but got (undefined) undefined
  │   │ FAIL [expected PASS] hangul U+AD93 \uad93 %26%2344435%3B
  │   │   → assert_equals: expected (string) "%26%2344435%3B" but got (undefined) undefined
  │   │ FAIL [expected PASS] hangul U+AD94 \uad94 %26%2344436%3B
  │   │   → assert_equals: expected (string) "%26%2344436%3B" but got (undefined) undefined
  │   │ FAIL [expected PASS] hangul U+AD95 \uad95 %26%2344437%3B
  │   │   → assert_equals: expected (string) "%26%2344437%3B" but got (undefined) undefined
  │   │ FAIL [expected PASS] hangul U+AD96 \uad96 %26%2344438%3B
  │   │   → assert_equals: expected (string) "%26%2344438%3B" but got (undefined) undefined
  │   │ FAIL [expected PASS] hangul U+AD97 \uad97 %26%2344439%3B
  │   │   → assert_equals: expected (string) "%26%2344439%3B" but got (undefined) undefined
  │   │ FAIL [expected PASS] hangul U+AD98 \uad98 %26%2344440%3B
[..]