safer.writer does not correctly wrap existing streams

[rec]

See unit test.

This is a serious bug that needs immediate fixing!

[rec]

The issue so far is that the underlying stream is not closed so the data is not written, but simply closing it breaks everything else. :-D

Still, I'm closer to a solution.

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Only one case left to fix, which seems to be a separate error!

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Could not resolve that last case - writing to a temp file. No one has hit it yet including me. Now in this one case I raise a NotImplementedException.

I see how to code it, but I'm out of time!