module ActiveModel::Validations::Clusivity

def include?(record, value)
  members = if delimiter.respond_to?(:call)
    delimiter.call(record)
  elsif delimiter.respond_to?(:to_sym)
    record.send(delimiter)
  else
    delimiter
  end
  if value.is_a?(Array)
    value.all? { |v| members.public_send(inclusion_method(members), v) }
  else
    members.public_send(inclusion_method(members), value)
  end
end