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path: document that Clean deletes trailing slashes.
Fixes #3492. R=golang-dev, rsc CC=golang-dev https://golang.org/cl/6112044
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@ -30,6 +30,9 @@ const (
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// that is, replace "/.." by "/" at the beginning of a path,
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// assuming Separator is '/'.
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//
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// The returned path ends in a slash only if it represents a root directory,
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// such as "/" on Unix or `C:\` on Windows.
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//
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// If the result of this process is an empty string, Clean
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// returns the string ".".
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//
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@ -21,6 +21,8 @@ import (
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// 4. Eliminate .. elements that begin a rooted path:
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// that is, replace "/.." by "/" at the beginning of a path.
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//
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// The returned path ends in a slash only if it is the root "/".
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//
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// If the result of this process is an empty string, Clean
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// returns the string ".".
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//
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