[Bug] Claude refuses to modify Unicode character literal ranges without explanation

Question

**Bug Description**
I was not able to get Claude generate a simple line like 
```
'\u4e00' <= ch <= '\u9fff' or  # CJK Unified Ideographs
```

It kept going in circles refusing to do what I asked:
"now modify _is_cjk() so that it references character literals by their unicodes."

The original code:
```
'一' <= ch <= '鿿' or  # CJK Unified Ideographs
```

it gave no explanation either, it just went in circles trying to do nothing.

**Environment Info**
- Platform: darwin
- Terminal: iTerm.app
- Ve