cf. users/29635: additional detail of parameter expansion in math context.

ChangeLog

@@ -1,5 +1,8 @@
 2024-02-04  Bart Schaefer  <schaefer@zsh.org>
 
+	* unposted (cf. users/29635): Doc/Zsh/arith.yo: additional detail
+	of parameter expansion in math context.
+
 	* 52521: Etc/BUGS: mapfile handling of empty/unreadable files
 
 2024-02-04  Mikael Magnusson  <mikachu@gmail.com>

Doc/Zsh/arith.yo

@@ -206,6 +206,11 @@ example,
 example(((val2 = val1 * 2)))
 
 assigns twice the value of tt($val1) to the parameter named tt(val2).
+If the expansion of tt($val1) is text rather than a number, then when
+tt(val1) is referenced that text is itself evaluated as a math expression
+as if surrounded by parentheses `tt(LPAR()$val1)tt(RPAR())'.  Expansion
+continues until there are no more parameter references, a number has
+resulted, or an expression error occurs.
 
 An internal integer representation of a named parameter
 can be specified with the tt(integer) builtin.