Save gas for pow by using uncheck #93
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We can use unchecked inside the for loop because we know that fp is in the range [0, 2^128), and it can save gas if n is large.
For the storage contract on Sepolia (fp = 340282366367469178095360967382638002176, n = 11043821), the gas cost before the change is 7145, and the cost after the change is 2829, according to the forge gas test report.