class Money::Allocation

def self.generate(amount, parts, whole_amounts = true)


Array — allocates the amounts proportionally to the given array
Numeric — performs the split between a given number of parties evenely
The parts can be specified as:

The results should always add up to the original amount.

parts listed first will likely receive more pennies than the ones listed later.
The left-over pennies will be distributed round-robin amongst the parts. This means that
Splits a given amount in parts without losing pennies. 
def self.generate(amount, parts, whole_amounts = true)
  parts = if parts.is_a?(Numeric)
    Array.new(parts, 1)
  elsif parts.all?(&:zero?)
    Array.new(parts.count, 1)
  else
    parts.dup
  end
  raise ArgumentError, 'need at least one party' if parts.empty?
  result = []
  remaining_amount = amount
  until parts.empty? do
    parts_sum = parts.inject(0, :+)
    part = parts.pop
    current_split = 0
    if parts_sum > 0
      current_split = remaining_amount * part / parts_sum
      current_split = current_split.truncate if whole_amounts
    end
    result.unshift current_split
    remaining_amount -= current_split
  end
  result
end