mwish

> Actually there are some difference in the query result between path $.x and .x (or x). It can be observe that query of path prefixed without $ will just...

@PragmaTwice I've add a JsonPath type, however, currently I find the `evaluation` has a problem when we need support both `const` and `mutable`. Would you mind take a look?

Note: this patch doesn't means fully compatible with Json legacy path, it just try it best to convert to JsonPath. There're still some behaviors we cannot compatible with. I found...

Redis itself uses a "bitmask" to mask the implementation: https://github.com/redis/redis/blob/unstable/src/bitops.c#L888 E.g. if bit 1 100, it will change to "byte", and mask the first / last byte with the bitmask....

1. Redis' impl uses code below: https://github.com/redis/redis/blob/unstable/src/bitops.c#L984-L997 2. bitpos util syntax would be clear: returning the "kth" bit in the input. I think we'd better keep RawBitpos clean and clear,...

Will wait for some days, and would merge it if no negative comments

Thanks all, merged!

cc @zanmato1984 if you're interested in this

Thanks @zanmato1984 ! cc @felipecrv @pitrou do we have some reviewers for ASOF join?

Maybe we should first having an memory-usage / performance benchmark on this?