MAINT: Ensure correct handling for very large unicode strings #27904
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In the future, we can handle these strings (in parts we already can maybe), but for now have to stick to `int` length because more of the code needs cleanup to actually use it safely. (For user dtypes this is less of a problem, although corner cases probably exist.) This adds necessary checks to avoid large unicode dtypes.
Also add future proof guard, just in case we got a larger string in addition.
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Backport of #27875.
In the future, we can handle these strings (in parts we already can maybe), but for now have to stick to int length because more of the code needs cleanup to actually use it safely. (For user dtypes this is less of a problem, although corner cases probably exist.)
This adds necessary checks to avoid large unicode dtypes.