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Fixes #6985
It converts indexes to ints in the constructor. It also changes the hash implementation to be precomputed in the constructor rather than lazy-computed. This eliminates an
if
branch from the__hash__
method, where speed is critical. The tradeoff is that it's always computed in the constructor, even if it's not used. But that's almost never the case: even creating an operation is dependent on hash(qid). And it will still allow creation of millions of qubits per second, so not a bottleneck in any real-world scenario.