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+* `master`
+  * The basis for the `1.y.z` series (e.g. `1.6.2`).
+* `0.y.z`
+  * The basis for the `0.y.z` series (e.g. `0.10.2`).
+  * `master` will be repeatedly *merged* into this. (In the past, we rebased this onto master.)
+* `private-0.y.z`
+  * A private branch, repeatedly *rebased* to `master`. This will always match `0.y.z`, but with a much cleaner history. It helps us to avoid merge mistakes.
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