Change lane:join() return values

* when no error is raised in the lane, lane:join() now precedes the lane returned values with true
* lane body is no longer forced to return something when used with join()
* adjusted all relevant unit tests accordingly

1 files changed, 3 insertions, 3 deletions

diff --git a/docs/index.html b/docs/index.html
index be8ad7f..ab8aed2 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -71,7 +71,7 @@
                         </p>
 
                         <p>
-                                This document was revised on 07-May-25, and applies to version <tt>4.0.0</tt>.
+                                This document was revised on 05-Jun-25, and applies to version <tt>4.0.0</tt>.
                         </p>
                 </font>
         </center>
@@ -1156,7 +1156,7 @@
 </p>
 
 <table border="1" bgcolor="#E0E0FF" cellpadding="10" style="width:50%"><tr><td><pre>
-        [...]|[nil,err,stack_tbl]= lane_h:join([timeout])
+        [true, ...]|[nil,err,stack_tbl]= lane_h:join([timeout])
 </pre></td></tr></table>
 
 <p>
@@ -1174,7 +1174,7 @@
                         </ul>
                 </li>
                 <li><tt>nil, "killed"</tt> if forcefully killed.</li>
-                <li>The return values of the lane function. If the first return value is <tt>nil</tt> (or there is no return value), an error is raised, to make sure you can tell timeout and error cases apart from successful return.</li>
+                <li><tt>true [, returned-values]</tt>: The return values of the lane function.</li>
         </ul>
         If the lane handle obtained from <tt>lanes.gen()</tt> is to-be-closed, closing the value will cause a call to <tt>join()</tt>. Since it is implicit, the lane body isn't forced to return non-<tt>nil</tt> in that case.
 </p>