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+\iffalse meta-comment
+
+File l3syntax-changes.tex Copyright (C) 2011-2012,2017 The LaTeX3 Project
+
+It may be distributed and/or modified under the conditions of the
+LaTeX Project Public License (LPPL), either version 1.3c of this
+license or (at your option) any later version. The latest version
+of this license is in the file
+
+ http://www.latex-project.org/lppl.txt
+
+This file is part of the "l3kernel bundle" (The Work in LPPL)
+and all files in that bundle must be distributed together.
+
+The released version of this bundle is available from CTAN.
+
+\fi
+
+\documentclass{l3doc}
+
+
+\title{%
+ Syntax changes in \LaTeX3 functions%
+}
+\author{%
+ The \LaTeX3 Project\thanks
+ {%
+ E-mail:
+ \href{mailto:latex-team@latex-project.org}%
+ {latex-team@latex-project.org}%
+ }%
+}
+\date{Released 2017/07/15}
+
+\newcommand{\TF}{\textit{(TF)}}
+
+\begin{document}
+
+\maketitle
+
+This file lists functions whose syntax has changed after August 2011,
+with an approximate date.
+
+\section{August 2011}
+
+\begin{itemize}
+ \item \cs{tl_if_single:n\TF} recognized any non-zero number of
+ explicit spaces as \meta{true}, and did not ignore trailing spaces.
+ Now it is \meta{true} for
+ \[
+ \meta{optional spaces}
+ \meta{normal token or brace group}
+ \meta{optional spaces}.
+ \]
+ \item \cs{tl_reverse:n} stripped outer braces and lost unprotected spaces.
+ Now it keeps spaces, leaves unbraced single tokens unbraced, and
+ braced groups braced.
+ \item \cs{tl_trim_spaces:n} only removed one leading and trailing space.
+ Now removes recursively. Also, on the left it used to strip implicit
+ and explicit spaces with any character code. Now it strips only explicit
+ space characters $(32,10)$.
+\end{itemize}
+
+\section{September 2011}
+
+\begin{itemize}
+\item clist functions which receive an \texttt{n}-type comma list argument
+ now trim spaces from each item in the argument.
+\end{itemize}
+
+\section{June 2012}
+
+\begin{itemize}
+ \item Access to list functions now indexes from~$1$, not from~$0$.
+ This applies to multiple choices in the \pkg{l3keys} module and
+ the \cs{clist_item:Nn}, \cs{seq_item:Nn} and \cs{tl_item:Nn}
+ functions.
+ \item \cs{tl_trim_spaces:n} now requires a variable number of
+ expansions to fully expand, rather than exactly two. Of course,
+ \texttt{x}-type expansion still correctly evaluates this function.
+\end{itemize}
+
+\section{July 2012}
+
+\begin{itemize}
+ \item The \cs{tl_if_head_eq_meaning:nN}, \cs{tl_if_head_eq_catcode:nN}
+ and \cs{tl_if_head_eq_charcode:nN} conditionals now never match when
+ their first argument is empty.
+\end{itemize}
+
+\section{August 2012}
+
+\begin{itemize}
+ \item \cs{lua_now:x} is now a standard \texttt{x}-type expansion of
+ \cs{lua_now:n}, which does no expansion. Engine-level expansion is moved
+ to \cs{lua_now_x:n}, reflecting the fact that this is non-standard in the
+ same way as for example \cs{str_if_eq_x:nn(TF)}.
+\end{itemize}
+
+
+\end{document}