(Equality Predicates): Null strings are uniquified.

doc/lispref/ChangeLog

+2007-10-26  Richard Stallman  <rms@gnu.org>
+
+	* objects.texi (Equality Predicates): Null strings are uniquified.
+
+	* minibuf.texi: Minor clarifications in previous change.
+
 2007-10-25  Glenn Morris  <rgm@gnu.org>
 
 	* customize.texi (Variable Definitions): Add :risky and :safe keywords.

doc/lispref/objects.texi

@@ -1871,7 +1871,7 @@ This function returns a symbol naming the primitive type of
 @cindex equality
 
   Here we describe two functions that test for equality between any two
-objects.  Other functions test equality between objects of specific
+objects.  Other functions test equality of contents between objects of specific
 types, e.g., strings.  For these predicates, see the appropriate chapter
 describing the data type.
 
@@ -1904,6 +1904,13 @@ by the same change in the contents of the other.
      @result{} nil
 @end group
 
+@group
+(eq "" "")
+     @result{} t
+;; @r{This exception occurs because Emacs Lisp}
+;; @r{makes just one multibyte empty string, to save space.}
+@end group
+
 @group
 (eq '(1 (2 (3))) '(1 (2 (3))))
      @result{} nil