title: Postgres modulus operator on strings
body: <p>I run this query on Postgres 9.4 and I don't know why it returns <strong>true</strong></p>
  
  <pre><code>SELECT 'Sao Paulo' % 'sao paulu'
  </code></pre>
  
  <p>Last character is different.
  Maybe its connected with full text search somehow?
  Or maybe some type casting is going in the background?</p>
  
  <p>Any suggestions on modulo with strings?</p>