(d) If the Work includes a "NOTICE" text file as part of its
          distribution, then any Derivative Works that You distribute must
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// Returns false on ties.
func (x xlMetaV2VersionHeader) sortsBefore(o xlMetaV2VersionHeader) bool {
	if x == o {
		return false
	}
	// Prefer newest modtime.
	if x.ModTime != o.ModTime {
		return x.ModTime > o.ModTime
	}

	// The following doesn't make too much sense, but we want sort to be consistent nonetheless.
	// Prefer lower types
	if x.Type != o.Type {
		return x.Type < o.Type
	}

      (d) If the Work includes a "NOTICE" text file as part of its
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      (d) If the Work includes a "NOTICE" text file as part of its
          distribution, then any Derivative Works that You distribute must
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          pertain to any part of the Derivative Works, in at least one
          of the following places: within a NOTICE text file distributed

      (d) If the Work includes a "NOTICE" text file as part of its
          distribution, then any Derivative Works that You distribute must
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      (d) If the Work includes a "NOTICE" text file as part of its
          distribution, then any Derivative Works that You distribute must
          include a readable copy of the attribution notices contained
          within such NOTICE file, excluding those notices that do not
          pertain to any part of the Derivative Works, in at least one
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      (d) If the Work includes a "NOTICE" text file as part of its
          distribution, then any Derivative Works that You distribute must
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      (d) If the Work includes a "NOTICE" text file as part of its
          distribution, then any Derivative Works that You distribute must
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          of the following places: within a NOTICE text file distributed