fix: undefined behaviour in metrics receiver #185
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Fixes a case where Java will happily pass a boolean value that the Rust side doesn't like.
This happens because Java must pass a full byte but the Java spec doesn't guarantee that the not boolean value bits are unset. Rust on the other hand, will not tolerate a boolean value that has values set that aren't the LSB; this triggers UB which gives us some weeeeeird behaviour (picked up in this case because counting a metric for a toggle more than once never incremented that toggle)