class Sprockets::ProcessedAsset

def encode_with(coder)
  super
  coder['source'] = source
  coder['dependency_digest'] = dependency_digest
  coder['required_paths'] = required_assets.map { |a|
    relativize_root_path(a.pathname).to_s
  }
  coder['dependency_paths'] = dependency_paths.map { |d|
    { 'path' => relativize_root_path(d.pathname).to_s,
      'mtime' => d.mtime.iso8601,
      'digest' => d.digest }
  }
end