Sort files before loading
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This will be fixed by https://github.com/huggingface/datasets/pull/3221
When loading a dataset that consists of several files (e.g. `my_data/data_001.json`, `my_data/data_002.json` etc.) they are not loaded in order when using `load_dataset("my_data")`.

This could lead to counter-intuitive results if, for example, the data files are sorted by date or similar since they would appear in different order in the `Dataset`.

The straightforward solution is to sort the list of files alphabetically before loading them.

cc @lhoestq 

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