code: func (c *Corpus) EnumeratePermanodesLastModified(fn func(camtypes.BlobMeta) bool) {
  	c.enumeratePermanodes(fn, c.permanodesByModtime.sorted(true))
  }
docs: // EnumeratePermanodesLastModified calls fn for all permanodes, sorted by most recently modified first.
  // Iteration ends prematurely if fn returns false.