ts the global "dont-tell-me" mode (default value: true). When 'true',
 bindings will *not* be returned for any variable (in a Query's goal)
 whose name begins with an underscore character (except for "anonymous"
 variables, i.e. those whose name comprises just the underscore character,
 whose bindings are never returned). When 'false', bindings are returned
 for *all* variables except anonymous ones; this mode may be useful when
 traditional top-level interpreter behaviour is wanted, e.g. in a
 Java-based P