func hasSuffixByte(s string, suffix byte) bool {
	return len(s) > 0 && s[len(s)-1] == suffix
}

// pathNeedsClean returns whether path.Clean may change the path.
// Will detect all cases that will be cleaned,
// but may produce false positives on non-trivial paths.
func pathNeedsClean(path []byte) bool {
	if len(path) == 0 {
		return true
	}

	rooted := path[0] == '/'
	n := len(path)

		// Combinations
		{"abc/./../def", "def"},
		{"abc//./../def", "def"},
		{"abc/../../././../def", "../../def"},
	}
	for _, test := range cleantests {
		want := test.path != test.result
		got := pathNeedsClean([]byte(test.path))
		if !got {
			t.Logf("no clean: %q", test.path)
		}
		if want && !got {
			t.Errorf("input: %q, want %v, got %v", test.path, want, got)
		}
	}