Add rationale as to why we create a new array with zero values

[kevaundray]

Problem

See : #1969 (comment)

When we do an array_set, we create a new array with zero values, then copy the old array into this new array, overwriting the zeroes.

Question was referring to why we don't just copy the new values into the array initially

Happy Case

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Alternatives Considered

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Additional Context

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