Array form of #each_slice

[HertzDevil]

#in_groups_of has an Array form, a block form, and an Iterator form:

[1, 2, 3].in_groups_of(2)                           # => [[1, 2], [3, nil]]
[1, 2, 3].in_groups_of(2) { |e| p e if nil.in?(e) } # => [3, nil]
[1, 2, 3].each.in_groups_of(2).next                 # => [1, 2]

#each_slice only has the last two:

[1, 2, 3].each_slice(2) { |e| p e if e.size == 1 } # => [3]
[1, 2, 3].each.slice(2).next                       # => [1, 2]
[1, 2, 3].each_slice(2).next                       # => [1, 2] # `Iterable` alias

There should be a method to fulfil that missing form, say:

module Enumerable(T)
  def in_slices_of(count : Int) : Array(Array(T))
  end
end

[1, 2, 3].in_slices_of(2) # => [[1, 2], [3]]