Only replace 0. with . at the begin of a size value.

[yunosh]

This fixes values of "10.5" accidentally being converted to "1.5".

I would have added a unit test, but 50% of the test suite is currently failing, so there's not much use in those.

[sabberworm]

Thanks for the pull requests. I’m thinking about removing the 0. → . optimization entirely, I was never a big fan of that but didn’t have enough reasons to deny the pull request that added it (#57).
Actually, none of the unit tests should be failing. Could you provide me with an example of the output? I usually run the complete test suite whenever I create a new version tag. Thanks a lot!

[yunosh]

The failed tests have been an intermittent issue, seems to work fine now, besides the changes introduced by my patch.