I think, you should use
<pre>
0.01
0.02
0.11
0.20
</pre>

If you want to change the version number from 0.1 to 0.01, I think, you can do that.
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Versions are sorted by date then by name (alphabetically), so what you describe is not a defect (1.1 < 1.10 < 1.2 is alphabetically correct).
What you expect is some kind of version numbering sort when names looks like x.y where x and y are integers.
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Are it not any way to first sort them after numbering?

/ Slaktarn
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SwedishMatch TimerWolf wrote:
> Are it not any way to first sort them after numbering?
>
> / Slaktarn

Or atlest if that not possibel first store after date and not name to get it right anyways it culd be a workaround
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I don't know of any versioning scheme in which "1.10" is smaller than "1.2". I think this issue deserves a higher priority, or even it could be set as a "defect".
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I guess the reason for this ticket not being solved within 10 years is the fact that there is no one-size-fits-all solution.

However, if you would refactor the code for the internal version sort to be extensible, I could help myself with a plugin.
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relates,New,6974,Define manually the versions order in Roadmap (when date isn't defined)
duplicates,Closed,7269,Sort versions by version numbers x.y.z{z} instead of alphabetically
duplicates,Closed,28035,Order of versions is not correctly ordered