in pl.read_csv: storage_options is modified inplace (an extra param called "encoding" is added inplace)

[giuliaviolatto]

https://github.com/pola-rs/polars/blob/c0b317904196151400fed81c1eccfc1f3a40f411/py-polars/polars/io/_utils.py#L236C13-L236C51

[giuliaviolatto]

In pl.read_csv: storage_options is modified inplace (by adding an extra param "encoding"). Instead: use a deepcopy of storage_option.

Consequence: when importing a csv, an extra param called "encoding" will be added to storage_option (this is not intended behavior),
and then you try to read a parquet, the error "ComputeError: unknown configuration key: encoding" will be generated, as encoding is not an accepted param for storage_option.

[alexander-beedie]

Thanks for the bug report :)

[giuliaviolatto]

thanks for solving it!