stdlib: Array.rotate rotates opposite to List.rotate

[spotandjake]

@alex-snezhko noticed that Array.rotate and List.rotate rotate in opposite directions with.

Array.rotate - Rotating to the right.
and
List.rotate - Rotating to the left.

While you are able to rotate the other direction by using negative indexes, The behaviour seems random from a user perspective and could cause confusion.

[alex-snezhko]

Since immutable arrays (#1477) make use of left-rotation like List, should Array be modified to rotate to the left as well?

[ospencer]

Yes. Left rotation for all.

Ruby's doc for it makes it feel really intuitive:

Returns a new array by rotating self so that the element at count is the first element of the new array.
If count is negative then it rotates in the opposite direction, starting from the end of self where -1 is the last element.