Add filter when column type is Number

With elements type String smart table setFilter function is working fine, but it's not working with elements of type number.

Let's say I want to list all data with temperature of 30. Example of setFilter function:

`this.source.addFilter({ field: 'temperature', search: 30 }, true, false);`

I'm getting

> No data found

Is there any difference when the number type is used?