-When an argument is an integer (not a sequence of integers), it is
-converted to a string of digits making up the decimal printed
-representation of the integer. @strong{Don't use this feature; we plan
-to eliminate it. If you already use this feature, change your programs
-now!} The proper way to convert an integer to a decimal number in this
-way is with @code{format} (@pxref{Formatting Strings}) or
+In Emacs versions before 21, when an argument was an integer (not a
+sequence of integers), it was converted to a string of digits making up
+the decimal printed representation of the integer. This obsolete usage
+no longer works. The proper way to convert an integer to its decimal
+printed form is with @code{format} (@pxref{Formatting Strings}) or