filter parameter should accept any character?
https://datasets-server.huggingface.co/filter?dataset=polinaeterna/delays_nans&config=default&split=train&where=string_col=йопта&offset=0&limit=100

gives an error

```
{"error":"Parameter 'where' is invalid"}
```
filter parameter should accept any character?: https://datasets-server.huggingface.co/filter?dataset=polinaeterna/delays_nans&config=default&split=train&where=string_col=йопта&offset=0&limit=100

gives an error

```
{"error":"Parameter 'where' is invalid"}
```