old_contents: 
  module.exports = remotePackages
  
  var registry = require("../registry")
    , containsSingleMatch = require("./contains-single-match")
    , getCompletions = require("./get-completions")
  
  /*
    Looks up remote packages for CLI tab-completion.
  
    NOTE: If doVersion is true, versions in the form <name>@<version>
          will be completed.
  
          If doTag is true, tags in the form <name>@<tag> will be
          completed.
  
          If recurring in true, sequences of multiple packages can be
          completed. i.e. for schemes such as:
          npm <command> <name>[@<version> [<name>[@<version>] ...]
  */
  function remotePackages (args, index, doVersion, doTag
                           , recurring, cb) {
    if (recurring || index < 3) {
      var name = (args.length + 1 === index) ? args[args.length - 1] : ""
      if (name === undefined) name = ""
      // use up-to 1 hour stale cache.  not super urgent.
      registry.get("/", null, 3600, function (er, d) {
        if (er) return cb(er)
        var remoteList = Object.keys(d)
          , found = remoteList.indexOf(name)
          , unique = found && containsSingleMatch(name, remoteList)
          , simpleMatches = getCompletions(name, remoteList)
          , uniqueMatch = unique && simpleMatches[0]
          , addTag = doTag && (unique || found || name.indexOf("@") !== -1)
          , addVer = doVersion && (unique || found || name.indexOf("@") !== -1)
          , list = []
          , pieces = (uniqueMatch || name).split("@")
          , pkgname = pieces[0]
          , extras = []
        if (unique && !addTag && !addVer) return cb(null, [name])
        if (d[pkgname] && (addTag || addVer)) {
          if (d[pkgname].versions && addVer) {
            extras = extras.concat(Object.keys(d[pkgname].versions))
          }
          if (d[pkgname]["dist-tags"] && addTag) {
            extras = extras.concat(Object.keys(d[pkgname]["dist-tags"]))
          }
          list = list.concat(extras.map(function (e) {
            return pkgname + "@" + e
          }))
        }
        if (!unique) list = list.concat(getCompletions(name, remoteList))
        return cb(null, list)
      })
    }
  }
  
new_contents: 
  module.exports = remotePackages
  
  var registry = require("../registry")
    , containsSingleMatch = require("./contains-single-match")
    , getCompletions = require("./get-completions")
  
  /*
    Looks up remote packages for CLI tab-completion.
  
    NOTE: If doVersion is true, versions in the form <name>@<version>
          will be completed.
  
          If doTag is true, tags in the form <name>@<tag> will be
          completed.
  
          If recurring in true, sequences of multiple packages can be
          completed. i.e. for schemes such as:
          npm <command> <name>[@<version> [<name>[@<version>] ...]
  */
  function remotePackages (args, index, doVersion, doTag
                           , recurring, cb) {
    if (recurring || index < 3) {
      var name = (args.length + 1 === index) ? args[args.length - 1] : ""
      if (name === undefined) name = ""
      // use up-to 1 hour stale cache.  not super urgent.
      registry.get("/", null, 3600, function (er, d) {
        if (er) return cb(er)
        var remoteList = Object.keys(d)
          , found = remoteList.indexOf(name)
          , unique = found && containsSingleMatch(name, remoteList)
          , simpleMatches = getCompletions(name, remoteList)
          , uniqueMatch = unique && simpleMatches[0]
          , addTag = doTag && (unique || found || name.indexOf("@") !== -1)
          , addVer = doVersion && (unique || found || name.indexOf("@") !== -1)
          , list = []
          , pieces = (uniqueMatch || name).split("@")
          , pkgname = pieces[0]
          , extras = []
        if (unique && !addTag && !addVer) return cb(null, [name])
        if (d[pkgname] && (addTag || addVer)) {
          if (d[pkgname].versions && addVer) {
            extras = extras.concat(Object.keys(d[pkgname].versions))
          }
          if (d[pkgname]["dist-tags"] && addTag) {
            extras = extras.concat(Object.keys(d[pkgname]["dist-tags"]))
          }
          list = getCompletions(name, list.concat(extras.map(function (e) {
            return pkgname + "@" + e
          })))
        }
        if (!unique) list = list.concat(getCompletions(name, remoteList))
        return cb(null, list)
      })
    }
  }
  
subject: Fix bug where list of remote pkg <name>@<version> pairs aren't filtered properly.