LWG3473 Normative encouragement in non-normative note

Author: burblebee

source/utilities.tex

@@ -21029,6 +21029,13 @@
 \pnum
 An instance of \tcode{basic_format_args} provides access to formatting
 arguments.
+Implementations should
+optimize the representation of \tcode{basic_format_args}
+for a small number of formatting arguments.
+\begin{note}
+For example, by storing indices of type alternatives separately from values
+and packing the former.
+\end{note}
 
 \indexlibraryctor{basic_format_args}%
 \begin{itemdecl}
@@ -21066,15 +21073,6 @@
 \tcode{i < size_ ?\ data_[i] :\ basic_format_arg<Context>()}.
 \end{itemdescr}
 
-\pnum
-\begin{note}
-Implementations are encouraged
-to optimize the representation of \tcode{basic_format_args}
-for small number of formatting arguments
-by storing indices of type alternatives separately from values
-and packing the former.
-\end{note}
-
 \rSec2[format.error]{Class \tcode{format_error}}
 
 \indexlibraryglobal{format_error}%