Two qustions about the latest BitMaps library

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1

Hi there, this sentence seems to suggest to use BitMaps, the keys are sequential. I don’t think it is necessary, is it?

Besides, is it possible to return the count of trues from this library efficiently? Just like the length function in the EnumerableSet library.

Thanks.

2

Answering my own second question: a Counters.Counter can be added in a smart contract calling set and unset functions. With proper setups, the counter value can work as length of the Bitmap.