class Gem::Indexer

def compact_specs(specs)
  names = {}
  versions = {}
  platforms = {}
  specs.map do |(name, version, platform)|
    names[name] = name unless names.include? name
    versions[version] = version unless versions.include? version
    platforms[platform] = platform unless platforms.include? platform
    [names[name], versions[version], platforms[platform]]
  end
end