prove we need Math.round

Author: RobinMalfait

packages/tailwindcss/src/constant-fold-declaration.test.ts

@@ -131,3 +131,7 @@ it('should not constant fold when dividing by `0`', () => {
 it('should not constant fold when a computation has a high-precision result', () => {
   expect(constantFoldDeclaration('calc(100% / 3.5)')).toBe('calc(100% / 3.5)')
 })
+
+it('should constant fold division results with floating-point error after scaling', () => {
+  expect(constantFoldDeclaration('calc(29% / 100)')).toBe('0.29%')
+})

packages/tailwindcss/src/constant-fold-declaration.ts

@@ -293,7 +293,7 @@ export function constantFoldDeclarationAst(
               // E.g. 100% / 3.5 = 28.571428571428573%, which is correct but not
               //      as user friendly. Especially when going from
               //      `w-[calc(100%/3.5)]` → `w-[28.571428571428573%]`
-              if (Math.floor(computed * 100) / 100 !== computed) {
+              if (Math.round(computed * 100) / 100 !== computed) {
                 break
               }