Binary logic operators for Container()
objects and
derived classes.
# S3 method for Dict
&(x, y)
# S3 method for Dict
|(x, y)
# S3 method for Set
&(x, y)
# S3 method for Set
|(x, y)
Depending on the operator at least one must be of class
Container()
or the respective derived class and the other at least be
coercible to the respective class.