nim-stint
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_addcarry_u64 only available on 64-bit platforms
https://github.com/status-im/nim-stint/blob/7c81df9adc80088f46a4c2b8bf2a46c26fab057c/stint/private/primitives/addcarry_subborrow.nim#L104 - on 32-bit platforms this should revert to a 32-bit add-with-carry implementation on 32-bit limbs
This is relevant for extracting primitives into an intops library