class AllocationStats::AllocationsProxy

Allocations) to the sum of the Allocation `#memsizes` within.
this transform maps each value in the Hash (which is an Array of
* If the current result set is a Hash (meaning it has been grouped), then
each Allocation to its `#memsize`.
* If the current result set is an Array, then this transform just maps

two ways:
Map to bytes via {Allocation#memsize #memsize}. This is done in one of

def bytes
  @mappers << Proc.new do |allocations|
    if allocations.is_a? Array
      allocations.map(&:memsize)
    elsif allocations.is_a? Hash
      bytes_h = {}
      allocations.each do |key, allocations|
        bytes_h[key] = allocations.inject(0) { |sum, allocation| sum + allocation.memsize }
      end
      bytes_h
    end
  end
  self
end