Add an extended value to this value set.
Add an extended value to this value set. If the extended value is a Star and the value set already contains a Star, we do not add it, since there is no need for more than one Star.
Returns the union of this value set with that value set.
Returns the union of this value set with that value set. If both have a Star, only one Star is kept in the result
Returns true if this value set does not contain any unspecified values.
Apply a function to each value while keeping the same Star nature.
Returns the regular values of this value set as plain values.
A value set that possibly contains unspecified values.