"Renaming" Hash Key

class Person
  attr_accessor :name
  def initialize(name)
    @name = name
  end
end

people = {}
person_1 = Person.new("Saul")
person_2 = Person.new("John")
people[person_1] = 7
people[person_2] = 5
puts people.inspect

person_1.name = "Paul"
puts people.inspect

# {#<Person:0x1001249d0 @name="Saul">=>7, #<Person:0x100124980 @name="John">=>5}
# {#<Person:0x1001249d0 @name="Paul">=>7, #<Person:0x100124980 @name="John">=>5}