hyperdrive-http sparse fail

index.js

var http = require('http')
var ram = require('random-access-memory')
var hyperdrive = require('hyperdrive')
var serve = require('./serve')

var archive = hyperdrive(ram)
archive.on('ready', function () {
  var clone = hyperdrive(ram, archive.key, {sparse: true})
  archive.writeFile('/hello.txt', 'world', function (err) {
    if (err) console.error(err)
    archive.writeFile('/hello2.txt', 'world', function (err) {
      if (err) console.error(err)
      var stream = clone.replicate()
      stream.pipe(archive.replicate()).pipe(stream)
      clone.metadata.update(start)
    })
  })

  function start () {
    var server = http.createServer(serve(clone))
    server.listen(8080)
    console.log(`Visit http://localhost:${8080} to see archive`)
  }
})

package.json

{
  "name": "sparse-http",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "hyperdrive": "^9.9.0",
    "random-access-memory": "^2.4.0"
  }
}

serve.js

module.exports = serve

function serve (archive) {
  return onrequest

  function onrequest (req, res) {
    var name = req.url
    archive.stat(name, function (err, st) {
      if (err) return onerror(res, 404, err)
      console.log(st)

      archive.readFile(name, function (err, data) {
        if (err) return onerror(res, 404, err)
        res.write(data)
        res.end()
      })
    })
  }
}

function onerror (res, status, err) {
  res.statusCode = status
  res.end(err.stack)
}

sparse-passing-test.js

tape('write and read (sparse)', function (t) {
  t.plan(13)

  tmp(function (err, dir, cleanup) {
    t.ifError(err, 'no error')
    var archive = hyperdrive(dir)
    archive.on('ready', function () {
      var clone = create(archive.key, {sparse: true})
      archive.writeFile('/hello.txt', 'world', function (err) {
        t.error(err, 'no error')
        archive.writeFile('/hello2.txt', 'world', function (err) {
          t.error(err, 'no error')
          var stream = clone.replicate()
          stream.pipe(archive.replicate()).pipe(stream)
          clone.metadata.update(checkFiles)
        })
      })

      function checkFiles () {
        clone.stat('/hello.txt', function (err, stat) {
          t.error(err, 'no error')
          t.ok(stat, 'has stat')
          t.notOk(stat.isDirectory(), 'not directory')
          clone.readFile('/hello.txt', function (err, data) {
            t.error(err, 'no error')
            t.same(data.toString(), 'world', 'data ok')
            clone.stat('/hello2.txt', function (err, stat) {
              t.error(err, 'no error')
              t.ok(stat, 'has stat')
              t.notOk(stat.isDirectory(), 'not directory')
              clone.readFile('/hello.txt', function (err, data) {
                t.error(err, 'no error')
                t.same(data.toString(), 'world', 'data ok')
              })
            })
          })
        })
      }
    })
  })
})