We have an existing `version_key` helper function for sorting versions.
It also does a better job, producing output like:
```
All recent (non-legacy) installable versions are:
3.1.31
3.1.31-asserts
3.1.30
3.1.30-asserts
3.1.29
3.1.29-asserts
```
Rather than:
```
All recent (non-legacy) installable versions are:
3.1.31
3.1.30
3.1.29
3.1.28
3.1.27
```
(with -assert versions listed after 3.1.0)
112 KiB
112 KiB