Implement Tokenizer_handle_tag_close_close()
Implement Tokenizer_handle_invalid_tag_start()
Implement Tokenizer_handle_single_only_tag_end(), Tokenizer_handle_single_tag_end()
Reset routes properly.
Correctly set TagOpenData's default values.
Refactor TagData code into dedicated functions.
Properly handle the first space after a tag name.
Route failure shouldn't be consumed before it reaches Tokenizer_parse_tag().
Fix unsafe context definitions.
Don't decrement refcount with PyList_SetItem().
Actually write to buffer with invalid tag starts.