diff --git a/bin/composer b/bin/composer
index cfdb05174..94c5c19b2 100755
--- a/bin/composer
+++ b/bin/composer
@@ -12,8 +12,11 @@ use Composer\Console\Application as ComposerApplication;
 
 // initialize repository manager
 $rm = new Repository\RepositoryManager();
-$rm->setLocalRepository(new Repository\FilesystemRepository('.composer/installed.json'));
-$rm->setRepository('Platform',  new Repository\PlatformRepository());
+$localRepository = new Repository\WrapperRepository(array(
+    new Repository\ArrayRepository('.composer/installed.json'),
+    new Repository\PlatformRepository(),
+));
+$rm->setLocalRepository($localRepository);
 $rm->setRepository('Packagist', new Repository\ComposerRepository('http://packagist.org'));
 
 // initialize download manager
@@ -24,7 +27,7 @@ $dm->setDownloader('git',  new Downloader\GitDownloader());
 
 // initialize installation manager
 $im = new Installer\InstallationManager();
-$im->setInstaller('vendor', new Installer\LibraryInstaller('vendor', $dm, $rm->getLocalRepository()));
+$im->setInstaller('library', new Installer\LibraryInstaller('vendor', $dm, $rm->getLocalRepository()));
 
 // load package
 $loader  = new Package\Loader\JsonLoader();
diff --git a/src/Composer/Command/InstallCommand.php b/src/Composer/Command/InstallCommand.php
index d93ef434d..3e63318df 100644
--- a/src/Composer/Command/InstallCommand.php
+++ b/src/Composer/Command/InstallCommand.php
@@ -63,13 +63,14 @@ EOT
 
         // creating repository pool
         $pool = new Pool;
+        $pool->addRepository($composer->getRepositoryManager()->getLocalRepository());
         foreach ($composer->getRepositoryManager()->getRepositories() as $repository) {
             $pool->addRepository($repository);
         }
 
         // creating requirements request
         $request = new Request($pool);
-        foreach ($this->getPackage()->getRequires() as $link) {
+        foreach ($composer->getPackage()->getRequires() as $link) {
             $request->install($link->getTarget(), $link->getConstraint());
         }
 
diff --git a/src/Composer/DependencyResolver/Solver.php b/src/Composer/DependencyResolver/Solver.php
index ab2cf3346..c21918262 100644
--- a/src/Composer/DependencyResolver/Solver.php
+++ b/src/Composer/DependencyResolver/Solver.php
@@ -50,6 +50,7 @@ class Solver
     protected $watches = array();
     protected $removeWatches = array();
     protected $decisionMap;
+    protected $installedPackageMap;
 
     protected $packageToUpdateRule = array();
     protected $packageToFeatureRule = array();
@@ -252,7 +253,7 @@ class Solver
             $this->addedMap[$package->getId()] = true;
 
             $dontFix = 0;
-            if ($this->installed === $package->getRepository() && !isset($this->fixMap[$package->getId()])) {
+            if (isset($this->installedPackageMap[$package->getId()]) && !isset($this->fixMap[$package->getId()])) {
                 $dontFix = 1;
             }
 
@@ -271,7 +272,7 @@ class Solver
                 if ($dontFix) {
                     $foundInstalled = false;
                     foreach ($possibleRequires as $require) {
-                        if ($this->installed === $require->getRepository()) {
+                        if (isset($this->installedPackageMap[$require->getId()])) {
                             $foundInstalled = true;
                             break;
                         }
@@ -294,7 +295,7 @@ class Solver
                 $possibleConflicts = $this->pool->whatProvides($link->getTarget(), $link->getConstraint());
 
                 foreach ($possibleConflicts as $conflict) {
-                    if ($dontFix && $this->installed === $conflict->getRepository()) {
+                    if ($dontFix && isset($this->installedPackageMap[$conflict->getId()])) {
                         continue;
                     }
 
@@ -309,7 +310,7 @@ class Solver
             /** @TODO: if ($this->noInstalledObsoletes) */
             if (true) {
                 $noObsoletes = isset($this->noObsoletes[$package->getId()]);
-                $isInstalled = ($this->installed === $package->getRepository());
+                $isInstalled = (isset($this->installedPackageMap[$package->getId()]));
 
                 foreach ($package->getReplaces() as $link) {
                     $obsoleteProviders = $this->pool->whatProvides($link->getTarget(), $link->getConstraint());
@@ -758,7 +759,7 @@ class Solver
         switch ($job['cmd']) {
             case 'install':
                 foreach ($job['packages'] as $package) {
-                    if ($this->installed === $package->getRepository()) {
+                    if (isset($this->installedPackageMap[$package->getId()])) {
                         $disableQueue[] = array('type' => 'update', 'package' => $package);
                     }
 
@@ -871,7 +872,7 @@ class Solver
 
             case 'remove':
                 foreach ($job['packages'] as $package) {
-                    if ($this->installed === $package->getRepository()) {
+                    if (isset($this->installedPackageMap[$package->getId()])) {
                         $disableQueue[] = array('type' => 'update', 'package' => $package);
                     }
                 }
@@ -933,6 +934,10 @@ class Solver
     {
         $this->jobs = $request->getJobs();
         $installedPackages = $this->installed->getPackages();
+        $this->installedPackageMap = array();
+        foreach ($installedPackages as $package) {
+            $this->installedPackageMap[$package->getId()] = $package;
+        }
 
         $this->decisionMap = new \SplFixedArray($this->pool->getMaxId() + 1);
 
@@ -954,12 +959,12 @@ class Solver
             foreach ($job['packages'] as $package) {
                 switch ($job['cmd']) {
                     case 'fix':
-                        if ($this->installed === $package->getRepository()) {
+                        if (isset($this->installedPackageMap[$package->getId()])) {
                             $this->fixMap[$package->getId()] = true;
                         }
                         break;
                     case 'update':
-                        if ($this->installed === $package->getRepository()) {
+                        if (isset($this->installedPackageMap[$package->getId()])) {
                             $this->updateMap[$package->getId()] = true;
                         }
                         break;
@@ -1039,7 +1044,7 @@ class Solver
                     break;
                 case 'lock':
                     foreach ($job['packages'] as $package) {
-                        if ($this->installed === $package->getRepository()) {
+                        if (isset($this->installedPackageMap[$package->getId()])) {
                             $rule = $this->createInstallRule($package, self::RULE_JOB_LOCK);
                         } else {
                             $rule = $this->createRemoveRule($package, self::RULE_JOB_LOCK);
@@ -1083,7 +1088,7 @@ class Solver
             $package = $literal->getPackage();
 
             // !wanted & installed
-            if (!$literal->isWanted() && $this->installed === $package->getRepository()) {
+            if (!$literal->isWanted() && isset($this->installedPackageMap[$package->getId()])) {
                 $updateRule = $this->packageToUpdateRule[$package->getId()];
 
                 foreach ($updateRule->getLiterals() as $updateLiteral) {
@@ -1098,7 +1103,7 @@ class Solver
             $package = $literal->getPackage();
 
             // wanted & installed || !wanted & !installed
-            if ($literal->isWanted() == ($this->installed === $package->getRepository())) {
+            if ($literal->isWanted() == (isset($this->installedPackageMap[$package->getId()]))) {
                 continue;
             }
 
diff --git a/src/Composer/Package/Loader/ArrayLoader.php b/src/Composer/Package/Loader/ArrayLoader.php
index 2f5ffad74..83a6e2051 100644
--- a/src/Composer/Package/Loader/ArrayLoader.php
+++ b/src/Composer/Package/Loader/ArrayLoader.php
@@ -110,8 +110,5 @@ class ArrayLoader
         if (!isset($config['version'])) {
             throw new \UnexpectedValueException('version is required for package');
         }
-        if (!isset($config['type'])) {
-            throw new \UnexpectedValueException('type is required for package');
-        }
     }
 }