title: using division operator (/) on strings in javascript
body: <p>I realized that in javascript all 101/100, "101"/100, 101/"100" and "101"/"100" result in 1.01 (checked on Chrome, FF and IE11). But I cannot find a piece of documentation regarding this behaviour.</p>
  
  <p>Therefore my question is if it is (cross-browser) safe to use this feature, and if it is a good practice to do so (or rather to use parseInt before division if the variable can be a string)?</p>