Here's a @rustlang generator with Iterator support for the Fibbonacci Sequence with overflow detection to avoid panicking.pic.twitter.com/5BvowNKrzF
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Some Add impls do allocate; of course, but on types that already do, like String. Not &str.
So by the same token, Add for a BigInt makes sense, but u128 + u128 = BigInt may be surprising.
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