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ViewerVTK: use header_type="UInt64" to use 64-bit byte counts in binary appended

Jed Brown requested to merge jed/viewer-vtk-binary-64bit into main

This feature is mentioned under HeaderType in these docs. Seems to have been supported for a long time.

https://kitware.github.io/paraview-docs/v5.8.0/python/paraview.simple.XMLPUnstructuredGridWriter.html

It was not documented in the file format docs. https://vtk.org/wp-content/uploads/2015/04/file-formats.pdf (PDF was created in 2003) https://kitware.github.io/vtk-examples/site/VTKFileFormats/#xml-file-formats

I've tested with Paraview and VisIt.

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