class Holidays::Definition::Repository::ProcResultCache

def validate!(function, function_arguments)
  raise ArgumentError.new("function must be a proc") unless function.is_a?(Proc)
  function_arguments.each do |arg|
    raise ArgumentError.new("function arguments '#{function_arguments}' must contain either integers or dates") unless arg.is_a?(Integer) || arg.is_a?(Date) || arg.is_a?(Symbol)
  end
end