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1467dab59e
This PR fixes two issues we found when testing the candidate codemodes: 1. Sometimes, core would emit the same candidate twice. This would result into rewriting a range multiple times, without realizing that this change might already be applied, causing it to swallow or duplicate some bytes. 2. The codemods were mutating the `Candidate` object, however since the `Candidate` parsing is _cached_ in core, it would sometimes return the same instance. This is an issue especially since we monkey patch the prefix to `null` when migrating prefixed candidates. This means that a candidate would be cached that would be _invalid relative to the real design system_. We fixed this by making sure the mutations would only be applied to clones of the `Candidate` and I changed the `DesignSystem` API to return `ReadOnly<T>` versions of these candidates. A better solution would maybe be to disable the cache at all but this requires broader changes in Core.