Keyed array elements in Go

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example := [3]float64{
        1.3,
        6.7,
        4.0,
}

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example := [3]float64{
        0: 1.3,
        1: 6.7,
        2: 4.0,
}

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example := [3]float64{
        1: 1.3,
        0: 6.7,
        2: 4.0,
}

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example := [...]float64{
        // index 0 is empty
        // index 1 is empty
        2: 4.0,    // index 2
}

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example := [...]float64{
        // index 1 to 4 are empty
        5: 1.3,    // index 5
        6.7,       // index 6
        0: 4.0,    // index 0
}