sdk: safer-calculate-spread-reserve-math (drift-labs#1681)

0xbigz · harsh4786 · commit c0b61b5f199a · 2025-10-24T01:58:48.000+05:30
diff --git a/sdk/src/math/amm.ts b/sdk/src/math/amm.ts
@@ -922,7 +922,7 @@ export function calculateSpreadReserves(
 				quoteAssetReserve: amm.quoteAssetReserve,
 			};
 		}
-		let spreadFraction = new BN(spread / 2);
+		let spreadFraction = new BN(spread).div(new BN(2));
 
 		// make non-zero
 		if (spreadFraction.eq(ZERO)) {

Original file line number	Diff line number	Diff line change
`@@ -922,7 +922,7 @@ export function calculateSpreadReserves(`
`922`	`922`	`quoteAssetReserve: amm.quoteAssetReserve,`
`923`	`923`	`};`
`924`	`924`	`}`
`925`		`- let spreadFraction = new BN(spread / 2);`
	`925`	`+ let spreadFraction = new BN(spread).div(new BN(2));`
`926`	`926`
`927`	`927`	`// make non-zero`
`928`	`928`	`if (spreadFraction.eq(ZERO)) {`