Commits on Jul 19, 2022

1. perf: implement HTML5 serialization in C …

   HTML 5 serialization was previously done entirely in Ruby.
   The Ruby code is slow. This reimplements the serialization in C.
   
   Reencoding happens after UTF-8 serialization.
   
   This is about 10x faster:
   
   ```
   C - ruby 3.2.0dev (2022-07-18T21:06:30Z master 85ea46730d) [x86_64-linux]:
         848.4 i/s
   C - ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x86_64-linux]:
         812.0 i/s - same-ish: difference falls within error
   ruby - ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) +YJIT [x86_64-linux]:
          86.3 i/s - 9.83x  (± 0.00) slower
   ruby - ruby 3.2.0dev (2022-07-18T21:06:30Z master 85ea46730d) +YJIT [x86_64-linux]:
          82.9 i/s - 10.24x  (± 0.00) slower
   ruby - ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x86_64-linux]:
          80.4 i/s - 10.55x  (± 0.00) slower
   ruby - ruby 3.2.0dev (2022-07-18T21:06:30Z master 85ea46730d) [x86_64-linux]:
          74.7 i/s - 11.36x  (± 0.00) slower
   ```
   
   Fixes: #2569
   
   Co-authored-by: Mike Dalessio <mike.dalessio@gmail.com>

   

   stevecheckoway and flavorjones committed Jul 19, 2022
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