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failure on low cpu count.

https://github.com/trisongz/file-io/blob/main/fileio/utils/configs.py#L27

    @lazyproperty
    def num_workers(self):
        return self.max_workers or min(2, round(mp.cpu_count() // 2))

returns 0 when num cpus is 1 (small ec2 instance).

causing

>>> import fileio
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/home/ubuntu/.cache/pypoetry/virtualenvs/financial-8ESj2M_l-py3.10/lib/python3.10/site-packages/fileio/__init__.py", line 6, in <module>
   from fileio.core.imports import pathlib
 File "/home/ubuntu/.cache/pypoetry/virtualenvs/financial-8ESj2M_l-py3.10/lib/python3.10/site-packages/fileio/core/__init__.py", line 3, in <module>
   from fileio.core.imports import pathlib
 File "/home/ubuntu/.cache/pypoetry/virtualenvs/financial-8ESj2M_l-py3.10/lib/python3.10/site-packages/fileio/core/imports.py", line 21, in <module>
   from fileio.aiopath.wrap import coro_as_method_coro, func_as_method_coro, to_thread, method_as_method_coro, func_to_async_func
 File "/home/ubuntu/.cache/pypoetry/virtualenvs/financial-8ESj2M_l-py3.10/lib/python3.10/site-packages/fileio/aiopath/wrap.py", line 12, in <module>
   _pool = futures.ThreadPoolExecutor(max_workers = settings.core.num_workers)
 File "/usr/lib/python3.10/concurrent/futures/thread.py", line 144, in __init__
   raise ValueError("max_workers must be greater than 0")
ValueError: max_workers must be greater than 0

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