title: Difference between == , = and eq
body: <p>I want to know the difference between these:</p>
  
  <pre><code> my $a = 1;
  </code></pre>
  
  <p>and</p>
  
  <pre><code> my $a == 1;
  </code></pre>
  
  <p>and</p>
  
  <pre><code> my $a eq 1;
  </code></pre>