The value type is appended to the value of the option element in the select dropdown using ng-options

HTML looks like this:

<select id="frontend-select" ng-model="tech.backEndValue" 
    ng-options="item.value as (item.name | translate) for item in techBackend">
</select>

      

        
        
        
      

    

The result of this:

<select ng-model="tech.backEndValue" ng-options="item.value as (item.name | translate) for item in techBackend">
    <option value="string:JAVA" label="Java" selected="selected">Java</option
    <option value="string:PHP" label="PHP">PHP</option>
</select>

      

        
        
        
      

    

Why are values ​​always appended with a value of type?