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class Bam
  def []=(key, value)
    "bam"
  end
end

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irb> # I'm expecting "bam" to be the return value
irb> Bam.new[:ham] = :bacon
# => :bacon

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irb> # But this works as expected
irb> Bam.new.public_send(:[]=, :ham, :bacon)
# => "bam"