[BUG][FIX] Problem in string comparaison in 3.8beta ( Can you suggest a test case? )

[tomkoenig at mindspring.com]

I created a subclass of string and tried to see if that would fail
without this change but it passed.

In addition the logic seems backwards
aString isString ifFalse: [
		aString class == MultiString ifTrue: [^ aString = self].
		aString isText ifTrue: [^ self = aString string].
		 false
	].
achieve the same thing and be cleaner?