CLOS: How to make a slot have an enforced type of vector of symbols?

Question

I\'m trying to create a class that can store a vector of symbols in a slot in SBCL. I cannot figure out how to set it up.

My best guess thus far has been

Answer 1

You might consider defining an :after method on slot accessor/writer. Also, the ultimate degree of control can be exercised by defining your own metaclass and customization of slot-value-using-class