to avoid 0 padding in Py3.5+ do not truncate #488
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I noticed this when testing out Cubes - specifically the the Slicer server.
I was running in Python 3.8.1 and noticed that CSVs had many null bytes - lots of them. This was causing all types of problems when loading and parsing these CSV. Upon tracking down the issue I noticed this was the result of calling `truncate on a StringIO stream.
Specifically the docs state:
"Changed in version 3.5: Windows will now zero-fill files when extending."