Synchronize EventSource.readyState updates
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…` to accept string `type`s
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Previously
readyStatewas tested and updated at will. Which produced race conditions and could lead to a closedEventSources continuously reopening.All changes to
readyStateare now serialized via the dispatch queue. Also updates that aren't the result of an explicit call from external code are checked to ensure they don't re-open an already closed instance.