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Adjust rules for canonical interface names #711

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22 changes: 15 additions & 7 deletions design/mvp/Explainer.md
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Expand Up @@ -2883,15 +2883,23 @@ type checking already required).

Any `valid semver` (as used in WIT) can be canonicalized by splitting it into
two parts - the `canonversion` prefix and the remaining `semversuffix`. Using
the `<major>.<minor>.<patch>` syntax of [Semantic Versioning 2.0], the split
point is chosen as follows:

- if `major` > 0, split immediately after `major`
the `<major>.<minor>.<patch>(-<pre>)(+<build>)` syntax of [Semantic Versioning
2.0], the split point is chosen as follows:

- build metadata, if present, is always part of the `semversuffix`
- `0.0.1+sha.5114f85` &rarr; `0.0.1` / `+sha.5114f85`
- if the version has a pre-release label, then the version itself is not split
- `0.0.1-alpha` &rarr; `0.0.1-alpha` / nothing
- `0.0.1-alpha+sha.5114f85` &rarr; `0.0.1-alpha` / `+sha.5114f85`
- otherwise if `major` > 0, split immediately after `major`
- `1.2.3` &rarr; `1` / `.2.3`
- `1.2.3+sha.5114f85` &rarr; `1` / `.2.3+sha.5114f85`
- otherwise if `minor` > 0, split immediately after `minor`
- `0.2.6-rc.1` &rarr; `0.2` / `.6-rc.1`
- otherwise, split immediately after `patch`
- `0.0.1-alpha` &rarr; `0.0.1` / `-alpha`
- `0.2.6` &rarr; `0.2` / `.6`
- `0.2.6+sha.5114f85` &rarr; `0.2` / `.6+sha.5114f85`
- otherwise, the version is already canonical
- `0.0.1` &rarr; `0.0.1`
- `0.0.1+sha.5114f85` &rarr; `0.0.1` / `+sha.5114f85`

When a version is canonicalized, any `semversuffix` that was split off of the
version should be preserved in the `versionsuffix` field of any resulting
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