Basic "In" method for Ruby, mimicking Python

in.rb

# Probably re-inventing the wheel for the umpteenth time, but figured I'd roll my own basic version.
# Probably also not production-code worthy, but serves well enough for the work I'm doing.
class Object
  def in(*other)
    raise(ArgumentError,"Other must be an enumberable type") unless other.is_a? Enumerable
    other.include? self
  end
end