Fix for Issue #409

[Hal Murray]

> That's not a fix, that's creating a latent security problem with clobbering
> a file name that's known in advance so you can plant things under that name
> and have it overwrite a different file that you normally wouldn't be able to
> access.

I'm not following what you are trying to describe.

If a bad guy can set things up so the write to a file does something nasty,  
can't they just do the nasty stuff directly?

Changing the mode would work.  But then we have to decide what mode to use.


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