title: hook_menu_alter() access callback returning TRUE results in list of nodes when trying to view a node
body: <p>I can't seem to figure out how to implement hook_menu_alter() to control access to a node. I've started with a bare Drupal 7 install, created two nodes, and created a module with only this code:</p>
  
  <pre><code>function mymodule_menu_alter(&amp;$items){
      $items['node/2']['access callback'] = TRUE;
  }
  </code></pre>
  
  <p>This should simulate an actual callback function returning TRUE, which is where I started off. But I'm trying to show the simplest possible case, here.</p>
  
  <p>If I set the access callback to "FALSE", it works as expected: I get "access denied" on node/2. But if I set it to TRUE, shouldn't I just get normal access to the node? Instead, when I go to node/2, I get a page similar to (but not exactly the same as) the default front page: a list of node teasers (In this case, showing the two nodes I created).</p>
  
  <p>I have cleared the cache (because I know hook_menu_alter() isn't called on every page view, but IS when the cache is cleared). I've also rebuilt permissions, to no avail. I'm sure I'm missing something dumb here, but I just can't think of it.</p>
  
  <p>I also tried it with an actual callback:</p>
  
  <pre><code>function mymodule_menu_alter(&amp;$items){
      $items['node/2']['access callback'] = 'mymodule_access_check';
  }
  function mymodule_access_check() {
      return TRUE;
  }
  </code></pre>