Expression rationalization gets stuck or takes too long (it worked in V9.5.1)

**Describe the bug**
Recently, I updated Math.js from version 9.5.1 to the latest version, and an expression rationalization that worked before doesn't work anymore. (see **To Reproduce**)

**To Reproduce**

```typescript
import * as mathjs from 'mathjs';

const aa = mathjs.parse("6285.67^5/(s+6285.67)^5");
const bb = mathjs.rationalize(aa, {}, false); // It gets stuck here

console.log(bb.toString());
```