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Make strongly-unique hyphen-insensitive #704

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10 changes: 7 additions & 3 deletions design/mvp/Explainer.md
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Original file line number Diff line number Diff line change
Expand Up @@ -2833,7 +2833,8 @@ within the same scope.
To determine whether two names (defined as sequences of [Unicode Scalar
Values]) are **strongly-unique**:
1. Canonicalize each name:
1. Lowercase all the `acronym`s (uppercase letters) in the name.
1. Remove all hyphens and lowercase all the `acronym`s (uppercase letters) in
the name.
2. If the name is `[method]l.l` or `[static]l.l` for some `label` `l`, replace
the name with `l` (e.g. `[method]foo.foo` becomes `foo`).
3. If the name has any `[...]` annotation prefix other than `[constructor]`,
Expand All @@ -2842,10 +2843,13 @@ Values]) are **strongly-unique**:
unequal.

Thus, the following set of names are strongly-unique and can thus all be imports (or exports) of the same component (or component type or instance type):
* `foo`, `foo-bar`, `[constructor]foo`, `[method]foo.bar`, `[static]foo.baz`, `foo:bar/baz`
* `foo`, `foo-bar`, `[constructor]foo`, `[method]foo.bar`, `[static]foo.baz`,
`foo:bar/baz`

but attempting to add *any* of the following names would be a validation error:
* `foo`, `FOO`, `foo-BAR`, `[constructor]FOO`, `[method]foo.BAR`, `[static]foo.bar`, `[method]foo.baz`, `[method]foo.foo`, `[static]foo-BAR.FOO-bar`, `foo:bar/BAZ`
* `foo`, `FOO`, `foo-BAR`, `foobar`, `foob-ar`, `[constructor]FOO`,
`[method]foo.BAR`, `[static]foo.bar`, `[method]foo.baz`, `[method]foo.foo`,
`[static]foobar.FOOBAR`, `foo:bar/BAZ`

The purpose of steps 1.2 and 1.3 is to play nice with constructors: in many languages, constructors are the only item that can have the same name as the class.

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