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Encoding error saving ...: 'utf-8' codec can't encode character '\udd73' in position 465: surrogates not allowed

rhai_watcher.rs のファイル保存エラー
Encoding error saving /home/tomoyan/my_projects/synapsphere/frontend/src-tauri/
src/rhai_watcher.rs: 'utf-8' codec can't encode character '\udd73' in position 465: 
surrogates not allowed

rhai_watcher.rs のファイル保存エラー
NetworkError when attempting to fetch resource.

$ mamba run -n jupyterlab jupyter lab --ip=0.0.0.0 --port=28888 --no-browser --debug

[I 2025-11-16 18:08:31.730 ServerApp] Saving file at /my_projects/synapsphere/frontend/src-tauri/src/rhai_watcher.rs
[D 2025-11-16 18:08:31.730 ServerApp] Saving /home/tomoyan/my_projects/synapsphere/frontend/src-tauri/src/rhai_watcher.rs
[W 2025-11-16 18:08:31.731 ServerApp] 400 PUT /api/contents/my_projects/synapsphere/frontend/src-tauri/src/rhai_watcher.rs?1763284111726 (127.0.0.1): Encoding error saving /home/tomoyan/my_projects/synapsphere/frontend/src-tauri/src/rhai_watcher.rs: 'utf-8' codec can't encode character '\udd73' in position 465: surrogates not allowed
[W 2025-11-16 18:08:31.731 ServerApp] wrote error: "Encoding error saving /home/tomoyan/my_projects/synapsphere/frontend/src-tauri/src/rhai_watcher.rs: 'utf-8' codec can't encode character '\\udd73' in position 465: surrogates not allowed"
    Traceback (most recent call last):
      File "/home/tomoyan/miniforge3/envs/jupyterlab/lib/python3.14/site-packages/jupyter_server/services/contents/fileio.py", line 604, in _save_file
        bcontent = content.encode("utf8")
    UnicodeEncodeError: 'utf-8' codec can't encode character '\udd73' in position 465: surrogates not allowed
    
    The above exception was the direct cause of the following exception:
    
    Traceback (most recent call last):
      File "/home/tomoyan/miniforge3/envs/jupyterlab/lib/python3.14/site-packages/tornado/web.py", line 1848, in _execute
        result = await result
                 ^^^^^^^^^^^^
      File "/home/tomoyan/miniforge3/envs/jupyterlab/lib/python3.14/site-packages/jupyter_server/auth/decorator.py", line 73, in inner
        return await out
               ^^^^^^^^^
      File "/home/tomoyan/miniforge3/envs/jupyterlab/lib/python3.14/site-packages/jupyter_server/services/contents/handlers.py", line 320, in put
        await self._save(model, path)
      File "/home/tomoyan/miniforge3/envs/jupyterlab/lib/python3.14/site-packages/jupyter_server/services/contents/handlers.py", line 245, in _save
        model = await ensure_async(self.contents_manager.save(model, path))
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/tomoyan/miniforge3/envs/jupyterlab/lib/python3.14/site-packages/jupyter_core/utils/__init__.py", line 214, in ensure_async
        result = await obj
                 ^^^^^^^^^
      File "/home/tomoyan/miniforge3/envs/jupyterlab/lib/python3.14/site-packages/jupyter_server/services/contents/largefilemanager.py", line 133, in save
        return await super().save(model, path)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/tomoyan/miniforge3/envs/jupyterlab/lib/python3.14/site-packages/jupyter_server/services/contents/filemanager.py", line 971, in save
        await self._save_file(os_path, model["content"], model.get("format"))
      File "/home/tomoyan/miniforge3/envs/jupyterlab/lib/python3.14/site-packages/jupyter_server/services/contents/fileio.py", line 610, in _save_file
        raise HTTPError(400, f"Encoding error saving {os_path}: {e}") from e
    tornado.web.HTTPError: HTTP 400: Bad Request (Encoding error saving /home/tomoyan/my_projects/synapsphere/frontend/src-tauri/src/rhai_watcher.rs: 'utf-8' codec can't encode character '\udd73' in position 465: surrogates not allowed)