UsingDirectiveHandler

It checks the values ascribed to the key inside the passed in scopedDirective, in order to see if they are of the types listed to be expected by the implementation of getSupportedTypes inside the specific handler.

It checks if the values assigned to the key of the scopedDirective have the expected type or number.

Note: the correct functioning of this method for some of the handlers might require overriding the implementations for getSupportedTypes, getValueNumberBounds, and unexpectedValueHint inside those handlers.

the default implementation only includes UsingDirectiveValueKind.STRING Override for changing it.

by default, it is (lower = 1, upper = Int.MaxValue). Please, override for other cases.

checks if the passed in scopedDirective has the expected number of values according to the implementation of getValueNumberBounds for the handler on which this is called

Is this directive an advanved feature, that will not be accessible when running scala-cli as scala

The default implementation just asks the user to put quotation marks around the using directive values with string type.

Therefore, it should get overrided if other information is to be shown instead in any particular handler.

This method gets internally called in the implementation of checkAndGroupValuesByType for producing the error value.