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I think it is best to completely remove the warning.
As a user I do not want to first figure out how many files I will be opening, and then set that with xarray to avoid a warning.
It was broken anyway, as it did always raise the warning, so I think it is best to remove the warning completely.
The first commit a4c0996 is still needed, as otherwise we may lower the limit, which is needed for other things.