Returns true if and only if the effects of the mod C<$mod> are already ensured by the current mod object, in which case no actual TikZ code will be emitted for C<$mod>.
Both mod objects are guaranteed to have the same C<tag>.
Returns true if and only if the effects of the mod C<$mod> are already ensured by the current mod object, in which case no actual TikZ code will be emitted for C<$mod>.
Both mod objects are guaranteed to have the same C<tag>.