feedback on javascript version detect in Opera 10

This is just a feedback. I am testing the version detection of Javascript
used in Opera as well as other browsers. From Wiki i realised that Opera 9 is still
using JS1.5. however in Opera 10, i checked using:

<script language="javascript1.5">alert("lang-1.5");</script>
<script language="javascript1.6">alert("lang-1.6");</script>
<script language="javascript1.7">alert("lang-1.7");</script>
<script language="javascript1.8">alert("lang-1.8");</script>
<script language="javascript1.9">alert("lang-1.9");</script>
<script language="javascript2.0">alert("lang-2.0");</script>

<script type="application/javascript;version=1.5">alert("1.5");</script>
<script type="application/javascript;version=1.6">alert("1.6");</script>
<script type="application/javascript;version=1.7">alert("1.7");</script>
<script type="application/javascript;version=1.8">alert("1.8");</script>
<script type="application/javascript;version=1.9">alert("1.9");</script>
<script type="application/javascript;version=2.0">alert("2.0");</script>

lang-1.5, lang-2.0 (or more) and 1.5 show up in the alert.