clarify that expanded literals are unsuffixed

Author: markbt

text/0000-macro-metavar-expr.md

@@ -105,10 +105,10 @@ expansion like:
     ${count(x)} $( $x )*
 ```
 
-the expression `${count(x)}` will expand to an integer literal equal to the
-number of times the `$( $x )*` repetition will repeat.  For example, if
-the metavariable `$x` repeats four times then it will expand to the integer
-literal `4`.
+the expression `${count(x)}` will expand to an unsuffixed integer literal
+equal to the number of times the `$( $x )*` repetition will repeat.  For
+example, if the metavariable `$x` repeats four times then it will expand to
+the integer literal `4`.
 
 If repetitions are nested, then an optional depth parameter can be used to
 limit the number of nested repetitions that are counted.  For example, a macro
@@ -128,7 +128,8 @@ of repetitions of `$x`.
 Within a repetition, the `${index()}` and `${length()}` metavariable
 expressions give the index of the current repetition and the length of the
 repetition (i.e., the number of times it will repeat). The index value ranges
-from `0` to `length - 1`, and the expanded values are integer literals.
+from `0` to `length - 1`, and the expanded values are unsuffixed integer
+literals so they are also suitable for tuple indexing.
 
 For nested repetitions, the `${index()}` and `${length()}` metavariable
 expressions expand to the inner-most index and length respectively.