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Making this change made me realize that adding an
`impl IntoIterator for T` can be a breaking change if
`impl IntoIterator for &T` already exists.
See also the cargo-semver-checks issue[1] I filed about that.
[1]: https://github.com/obi1kenobi/cargo-semver-checks/issues/518
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This has a number of benefits:
* it hides the implementation of the map
* it hides the type used for the map values
(which lets us e.g. change name_span to name_offset while still
being able to provide a convenient `Attribute::name_span` method.)
* it lets us provide convenience impls for the map
such as `FromIterator<(String, String)>`
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This is done separately so that the following commit has a cleaner diff.
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