add compiler variable/constant limit to limitations

website/guide/limitations.html

@@ -90,6 +90,14 @@ compliance concern, but degrades performance.</p>
 are scanned <tt>2**n</tt> times, where <tt>n</tt> is the function level
 (0, 1, ...).</p>
 
+<h3>Compiler variable/constant limit</h3>
+
+<p>The compiler currently has internal limitations dealing with functions
+with more than about 128 variables or constants.  This is a concrete issue
+with object and array literals which may become too large to compile even
+in quite normal situations.  This will be fixed soon.  The limitation is in
+the compiler, the bytecode supports a large constant set.</p>
+
 <h3>Global/eval code is slower than function code</h3>
 
 <p>Bytecode generated for global and eval code cannot assign variables