Ruby allows multiple assignment:

a, b, c = o

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In order to prove multiple values from a single object, Ruby calls #to_a on the object:

o = String.new('O')
def o.to_a
  [1,2,3]
end

a, b, c = o # Implicit call to #to_a here
a # => 1
b # => 2
c # => 3

Hence, if you want your class to support multiple assignment, make sure to define a #to_a method.