optimize roaring_bitmap_statistics (breaking change)

[AviAvni]

implement #619

[AviAvni]

@Dr-Emann ping

[lemire]

Looks good to me. It is a breaking change, but one that should be fine.

[lemire]

Feedback invited!!!

[Dr-Emann]

LGTM

@lemire do you have a place to keep track of "things to change next major version"? Removing the sum field entirely seems like a good thing to do next major version bump.

[lemire]

do you have a place to keep track of "things to change next major version"? Removing the sum field entirely seems like a good thing to do next major version bump.

I would propose just doing a major version now, and indicating this breaking change.

If there is general agreement, I would just do it as simply as that.

I am not aware of any other breaking change, are you?

I mean, we added many things, but it would be the first time we remove some functionality in a long time.

[lemire]

I am going to merge and issue a major version.