<h3 dir="auto">Version</h3>
<p dir="auto">2.5.1</p>
<h3 dir="auto">Reproduction link</h3>
<p dir="auto"><a href="https://jsfiddle.net/tbonz/0xx2wxjn/" rel="nofollow">https://jsfiddle.net/tbonz/0xx2wxjn/</a></p>
<h3 dir="auto">Steps to reproduce</h3>
<p dir="auto">In the provided jsfiddle, choose option 'three' from the dropdown, the selected option displayed instead shows 'one'.</p>
<h3 dir="auto">What is expected?</h3>
<p dir="auto">It is expected that the option selected would be displayed.  Using a unique key for each option has no effect either.</p>
<h3 dir="auto">What is actually happening?</h3>
<p dir="auto">It's not showing the option selected, and instead choosing another option with the same value.</p>
<h3 dir="auto">Vue.js version</h3>
<p dir="auto">2.0.3</p>
<h3 dir="auto">Reproduction Link</h3>
<p dir="auto"><a href="https://jsfiddle.net/dede89/rq049kpp/" rel="nofollow">https://jsfiddle.net/dede89/rq049kpp/</a></p>
<h3 dir="auto">Steps to reproduce</h3>
<p dir="auto">Click on change button to update the array.</p>
<h3 dir="auto">What is Expected?</h3>
<p dir="auto">The dom should update and display "James" and "Bill"</p>
<h3 dir="auto">What is actually happening?</h3>
<p dir="auto">Only "James" is displayed. The following warning is logged on the console:</p>
<p dir="auto">[Vue warn]: It seems there are duplicate keys that is causing an update error. Make sure each v-for item has a unique key.</p>
<p dir="auto">And then an exception is the raised:<br>
Uncaught (in promise) TypeError: Cannot read property 'tag' of undefined(…) lign 4044</p>