Step 1 - Fork this repository.
Step 2 - Clone the repository to yuor local machine.
Step 3 - Resolve this bugs, mentions provided in the Issues section of the repository. Also add a description what changes you ahve done.
Step 4 - Add the changes to your repository.
Step 5 - Create a PULL Request. And that's all.

Seen with @arnetheduck.

for uint128, stint properly generates add + adc (see status-im/nim-stint#10)

But for uint256+, the way carry is done will loop multiple time on the low half
https://github.com/status-im/nim-stint/blob/9993b9dca4a2dbf76bc432252ad4e8db944ae831/stint/private/uint_addsub.nim#L17-L29

Important for WASM codesize optimization.

• Benchmark suite.
• Compare with Rust.
• Compare with incoming javascript's BigInt.