strings: problem for strings.Split()

if param s is an empty string, the result of strings.Split() should be an empty slice. But not now.

eg:

len(strings.Split("", ",")) // result: 1

Working as intended, and clearly documented:

If s does not contain sep and sep is not empty, Split returns a slice of length 1 whose only element is s.

Whether s itself is empty or not plays no role. This makes for a more robust API.

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