fix(tokenizer): expose `errors`

tokenization_arcade100k.py

@@ -111,6 +111,8 @@ class Arcade100kTokenizer(PreTrainedTokenizer):
         **kwargs,
     ):
         super().__init__(errors=errors, **kwargs)
+        self.errors = errors
+
         self._tiktoken_config = _arcade100k(vocab_file)
         self.tokenizer = tiktoken.Encoding(**self._tiktoken_config)