mdwmath.dtx: Use `\@testopt', which I've just noticed.

diff --git a/mdwmath.dtx b/mdwmath.dtx
index 0b8dc36..2f93b1b 100644 (file)
--- a/mdwmath.dtx
+++ b/mdwmath.dtx
@@ -27,7 +27,7 @@
 %<+package>                [2020/09/06 1.14.0 Nice mathematical things]
 % \end{meta-comment}
 %
-% \CheckSum{728}
+% \CheckSum{727}
 %% \CharacterTable
 %%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
 %%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
@@ -872,8 +872,8 @@
 % macro |\bbigg@|.
 %
 %    \begin{macrocode}
-\def\@bbigg#1{\@ifnextchar[{\@bigg@i{#1}}{\@bigg@i{#1}[\z@]}}
-\def\@bigg@i#1[#2]#3#4{#1{\bbigg@{#2}{#3}{#4}}}
+\def\@bbigg#1{\@testopt{\@bbigg@i{#1}}\z@}
+\def\@bbigg@i#1[#2]{#1{\bbigg@{#2}}}
 %    \end{macrocode}
 %
 % \end{macro}