julia

413fc475 - Detangle Slice and fix mixed-dimension in-place reductions (#28941)

Detangle Slice and fix mixed-dimension in-place reductions (#28941) * Detangle Slice between whole dimensions and axes We use axes in many downstream computations that may not re-index directly into the original array, so we add a second type parameter to `Slice` that is turned on when converting `:` in indexing expressions -- and really only `SubArray` cares about. * Reduce allocations for in-place reductions and fix mixed-dimensionality edge-cases Alleviates #28928 but does not completely remove allocations due to the allocation of the view that gets passed to `map!`. * Introduce a whole new IdentityUnitRange that we will encourage offset array implementations to use instead of Base.Slice * Test that maximum! allocates less