cal10n-api mvn dependency leaks from slf4j-ext, thus projects depending on the latter would get CAL10NAnnotationProcessor to their compile phase.

It doesn't look like it's a significant impact on compilation performance, but a compilation warning can be caused by the @SupportedSourceVersion(SourceVersion.RELEASE_5)) declared in the annotation processor.

Marking cal10n-api dependency as optional in slf4j-ext would free dependants from declaring an exclusion