Watch out for reference duplication instead of instance duplication

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# This code will generate 96 instances
ViewStatData = Struct.new(:total, :target, :ratio)
96.times.map {|_|ViewStatData.new(0, 0, 0)}
# And this will not, it'll generate 96 pointers
[ViewStatData.new(0, 0, 0)] * 96
# So Watch out!!!

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