Mostly in documentation (the description field, for instance), but also
some long literal strings. Lua 5.2 introduces a string escape, "\z",
which escapes any amount of subsequent whitespace, including newlines.
This can be used to wrap string literals without upsetting indentation.
http://www.lua.org/manual/5.2/manual.html#3.1
This is the default and can be omitted. Seeing as the value of this
argument was "hardmatched" in 100% of cases, we're better off pretending
the parameter doesn't exist.
