Verify treatment of versions without a leading digit

[andrewpollock]

          I wonder if this special case should be 0-1 instead. (the bug.py implementation may be wrong here). 

This is also more consistent with https://maven.apache.org/pom.html#version-order-specification where ".1" actually means "0.1"

Originally posted by @oliverchang in #1022 (comment)

[github-actions]

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