title: Getting Firestore Document with ID same as UID fails
body: <p>Trying to access Firestore document having uid as it's id fails, document isn't found. </p>
  
  <p>I have a really simple setup and trying to learn Vue and utilising Firebase functionalities. I'm successfully using Firebase authentication but when trying to access Document in Firestore, which's id is the same as uid for the user, document isn't found.</p>
  
  <p>Security rules are set as open as possible, so that they shouldn't cause problem (you shouldn't use this in production):</p>
  
  <pre><code>rules_version = '2';
  service cloud.firestore {
    match /databases/{database}/documents {
      match /users/{userId} {
          allow read, write: if true;
      }
    }
  }
  </code></pre>
  
  <p>Js code for firebase</p>
  
  <pre><code>firebase.initializeApp(config)
  
  // firebase utils
  const db = firebase.firestore()
  
  // firebase collections
  const usersCollection = db.collection('users')
  
  usersCollection.doc('testid').get().then((userSnapshot) =&gt; {
    if (userSnapshot.exists) {
      console.log('User data:', userSnapshot.data())
    } else {
      console.log('No such document!')
    }
  }
  </code></pre>
  
  <p>Running previous code succeeds and I get data from Firestore for the Document with id <strong><em>testid</em></strong>. But when I substitute the <strong><em>testid</em></strong> with uid of the user 
  <strong><em>KmJ9JC5Zb0O45d8xcndVgAowIzF2</em></strong>, document isn't found.</p>
  
  <p>Data should be fine in Firestore:</p>
  
  <p><a href="https://drive.google.com/uc?id=1TZM6OajtcGn_sNcvNAf1NL1xMk-Aey8n" rel="nofollow noreferrer">Link to image showing Firestore data</a> (couldn't add image directly here beacuse don't have enough reputation... :)</p>
  
  <p>The mistake must be really simple but I've been banging my head with this problem for a while and decided to ask the community.</p>