good first issuestalet:enhancement
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Description
Issue
Panicked at 'U256: attempt to multiply with overflow' for some values.
Reproduce
Multiply two RationalU256 numbers, when both two numerators (or denominators) are big but their greatest common divisor is small.
For example:
use ckb_types::{core::RationalU256, u256, U256};
fn main() {
let x = u256!("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
let x_rational = RationalU256::from_u256(x.clone());
let numerator = 33u32;
let denominator = 100u32;
let y_rational = RationalU256::new(U256::from(numerator), U256::from(denominator));
let z_rational = x_rational * y_rational; // panicked in this line!
let z = z_rational.into_u256();
println!("{:#x} = {:#x} * {}/{}", z, x, numerator, denominator);
}
Ref: nervosnetwork/ckb-light-client#44