Ion-select compareWith NOT firing

Ionic Framework Ionic Vue
3

the doc is unclear

By default, the select uses object equality (===) to determine if an option is selected. This can be overridden by providing a property name or a function to the compareWith property.

but then later in properties

**compareWith**
Description	
A property name or function used to compare object values

Attribute	**compare-with**
Type	((currentValue: any, compareValue: any) => boolean) | null | string | undefined