Any sharp corner will be what is called a stress concentrator and if the boom cracks, the crack will start there. Better to remove the sharp corner with a round file so that it will take more stress for the boom to crack and have it crack somewhere else. Removing even a fair amount of metal to make the corner round will be stronger than having it have a sharp edge. A round hold in the boom will remove almost no strength. A square hole would weaken it a fair amount.
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