Footnotes in table captions & latex/pdf output

[njbart]

While figure captions have been fixed to allow footnotes (see #1506; c4ea642), it seems table captions have somehow slipped through the cracks.

MWEs:

pandoc -o test.pdf << EOT
![A picture^[from https://en.wikipedia.org/wiki/Flower]](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Flower_poster_2.jpg/330px-Flower_poster_2.jpg)
EOT

works nicely, while

pandoc -o test.pdf << EOT

One   Two
----- -----
Three Four
Five  Six

: A table caption^[With a footnote]

EOT

fails with the error message

Error producing PDF.
! Use of \LT@array doesn't match its definition.
\@ifnextchar ... \reserved@d =#1\def \reserved@a {
                                                  #2}\def \reserved@b {#3}\f...
l.121 ... table caption\footnote{With a footnote}}

My understanding is that the strategy used for figures, i.e.

\begin{figure}
...
\caption[caption without footnote, for lof]{caption with footnote replaced by\footnotemark}
\end{figure}
\footnotetext{The footnote}

should be used for (long)tables, too.

If I understand https://tex.stackexchange.com/questions/50151/footnotes-in-longtable-captions correctly, \footnotetext{} may even be used inside a longtable environment, as long as it does not appear in the ‘head’ or ‘foot’ sections of the table.