Errors in netcdf save code relating to string data.

[pp-mo]

Just spotted this, found that some places in the netcdf code are testing for dtype.kind == 'u' which does not work, should be capital - 'U' Creating an Issue instead of PR for now, as not clear what the implications of this are, nor what might change if you fix it

🐛 Bug Report

This is a coding bug, not seen what actual behaviour might be -- that needs investigation.

Happens here and here, but is correct here.

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[pp-mo]

I think this is maybe still worth dealing with, especially if it links to problems I more recently stumbled over e.g. #5362 #4412

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In order to maintain a backlog of relevant issues, we automatically label them as stale after 500 days of inactivity.

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