[Question] Version discrepency from git repo

[gbonnema]

I was browsing the git repo to find the current crate from crate.io (0.3.13) and ..... I couldn't find it! Weird because it is the version from crate.io. Now I am new to rust, so I may be missing something, but should that version be somewhere in the master branch of git?

Using tig I found immediately after 0.3.6 a commit saying "prevent publishing master as 0.3.x" and no "0.3.13" thereafter. This all while `crate search mime" gets mime version="0.3.13".

When you have time, could you enlighten me how this works?

EDIT : using gitg I saw that 0.3.13 is in a non-master branch, a specific 0.3.x branch.
What is the reasoning behind this? Why isn't 4.0-alpha in a separate branch instead? I just want to understand. If you don't like the query, just close it, no offense taken.