Is your feature request related to a problem?

Post retrieval limited to 5 posts made its way into production briefly.

Describe the solution you'd like

AbstractFunctionRestrictionSniff to make a call to [ static::class, 'defaulted_callback' ] in the case of that function being defined in sub-classes, making it simple to construct sniffs which warn of certain default arguments - such as 'numberposts' in PostsPerPageSniff.

• [?] I intend to create a pull request to implement this feature.