Hi,
I'm writing a type implementing ReadDirFile interface, and I have some 
doubts how I should implement ReadDir method.
The comment says on one hand: "Subsequent calls on the same file will yield 
further DirEntry values." and on the other "If n <= 0, ReadDir returns all 
the DirEntry values from the directory // in a single slice.".
So what should be returned if user first calls dir.ReadDir(1) and next 
dir.ReadDir(0)?
Should the second call return all the DirEntry values or only the further 
ones?

Best,
Piotr

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