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The test coverage generated by istanbul in v2 gets "corrected" if you use v3 to merge it together to create a summary. It's not clear to me yet why jest isn't creating already-correct test coverage output even when using v3 transitive dependencies of istanbul (is this a bug? is it due to using a slightly older version of jest?), but the workaround is to merge it with itself even when not using concurrency.
This PR adds that merge approach, and also cleans up the documentation around the focusing this tool's use case to just be intended for CI.