Inconsistent validation for string type fields.

I have multiple fields where the type is defined as: [string, null] some fields will allow a integer value whereas other will show a warning. For example, I have two fields defined as:
```
{"title":"Os Minorversion","type":["string","null"]}
{"title":"Os Version","type":["string","null"]}
```
Os Version doesn't show a warning when entering an integer, however, Os Minorversion will.

I'm using jsoneditor v9.10.2 within an Angular v14.3.0 project.

I've tried rolling back all the way to jsoneditor v9.7.4, but this issue still persists.