Data types in the XML files

The documentation states

So it would appear that only Int32 are supported for the cells.
Is this true?

If so, that would be bad news for me. I want to visualize a mesh of 840M tetrahedra,
and I would obviously run out of the range.

No, you can use Int64 if you want and if you built VTK with the right option, it will be the default (VTK_USE_64BIT_IDS)

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