fix: negative number should support round (#383)

Author: zombieJ

src/utils/MiniDecimal.ts

@@ -282,7 +282,7 @@ export function toFixed(numStr: string, separatorStr: string, precision?: number
 
     if (advancedNum >= 5) {
       const advancedDecimal = getMiniDecimal(numStr).add(
-        `0.${'0'.repeat(precision)}${10 - advancedNum}`,
+        `${negativeStr}0.${'0'.repeat(precision)}${10 - advancedNum}`,
       );
       return toFixed(advancedDecimal.toString(), separatorStr, precision);
     }

tests/util.test.tsx

@@ -145,5 +145,10 @@ describe('InputNumber.Util', () => {
     it('should return "" when input is ""', () => {
       expect(toFixed('', '.')).toEqual('');
     });
+
+    it('negative', () => {
+      // expect(toFixed('77.88', '.', 1)).toEqual('77.9');
+      expect(toFixed('-77.88', '.', 1)).toEqual('-77.9');
+    });
   });
 });