Returns a short human-readable string representation of the object. The
exact form of this representation depends on the object and might not alone
be sufficient to reconstruct the object. All objects must be able to produce
a short string representation of themselves in this way, even if the object
does not have a string value. See
Section 4.2.11, “Required String Values” for more information.
defaultName returns a string that identifies the class of
the object, for example,
an Array or
a Directory.
