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Reimplement RepeatedField<T> using an array as the backing store.
This is effectively reimplementing List<T>, but with a few advantages: - We know that an empty repeated field is common, so don't allocate an array until we need to - With direct access to the array, we can easily convert enum values to int without boxing - We can relax the restrictions over what happens if the repeated field is modified while iterating, avoiding so much checking This is somewhat risky, in that reimplementing a building block like this is *always* risky, but hey... (The performance benefits are significant...)
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