Function hasHash

mixins/mem-db.js:47–52

(hash, callback)

  }

  function hasHash(hash, callback) {
    return makeAsync(function () {
      if (!isHash.test(hash)) hash = refs[hash];
      return hash in objects;
    }, callback);
  }

  function saveAs(type, body, callback) {
    return makeAsync(function () {