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class C
        @a = StaticArray(UInt8, 4).new 0

        def b
                b = @a.to_slice
                b[1] = 1_u8

                c = @a
                c.to_slice
                c[2] = 2_u8
        end
end

c = C.new

c.b
p c

The second modification doesn’t modify the original StaticArray.
Output:

#<C:0x10c19eff0 @a=StaticArray[0, 1, 0, 0]>