Allow Range start to equal Range End

[florent-martineau]

Let's say you want to take the 20th row.

In the playground:

• If I do take 20 I'll get the first 20 rows, not exactly the 20th.
• If I do take 20..20 I get an error "Range end is before its start.".
• If I do take 20..21 I'll get rows 20 and 21, then if I do take 1 it will throw me an error

There are workarounds, but I think it would be a nicer API to simply say take 20..20?

This fails because Range start cannot equal Range end. Maybe we could also start to equal end in a Range?

[max-sixty]

This would be very welcome, and should be quite an easy chanhe — essentially removing that check (which I guess was added when we were thinking about doing 0-based indexing)

Thanks for the issue @florent-martineau

[max-sixty]

Fixed by @Shuozeli in #946, thank you!