RUSTSEC-2020-0152: max7301: ImmediateIO and TransactionalIO can cause data races


The ImmediateIO and TransactionalIO types implement Sync for all contained Expander<EI> types regardless of if the Expander itself is safe to use across threads.

As the IO types allow retrieving the Expander, this can lead to non-thread safe types being sent across threads as part of the Expander leading to data races.

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