title: How filter woocommerce products by min and max values of attribute?
body: <p>The products have the attribute Tempo. This is a text field in which to enter the number. </p>
  
  <p>How to sort products by the minimum and maximum attribute value? 
  using such url <code>?filtering=1&amp;filter_min-tempo=100&amp;filter_max-tempo=150</code></p>
  
  <p>Is it possible to create an attribute of type integer?</p>