diff --git a/_static/documentation_options.js b/_static/documentation_options.js
index 4068b6b8..ba50cedb 100644
--- a/_static/documentation_options.js
+++ b/_static/documentation_options.js
@@ -1,5 +1,5 @@
 const DOCUMENTATION_OPTIONS = {
-    VERSION: '1.8.88',
+    VERSION: '1.8.89',
     LANGUAGE: 'en',
     COLLAPSE_INDEX: false,
     BUILDER: 'html',
diff --git a/dflow.client.html b/dflow.client.html
index 8338a8fe..2d2dc0ec 100644
--- a/dflow.client.html
+++ b/dflow.client.html
@@ -5,12 +5,12 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="viewport" content="width=device-width, initial-scale=1" />
 
-    <title>dflow.client package &#8212; dflow 1.8.88
+    <title>dflow.client package &#8212; dflow 1.8.89
  documentation</title>
     <link rel="stylesheet" type="text/css" href="_static/pygments.css?v=fa44fd50" />
     <link rel="stylesheet" type="text/css" href="_static/classic.css?v=def86cc0" />
     
-    <script src="_static/documentation_options.js?v=768ffb89"></script>
+    <script src="_static/documentation_options.js?v=d2f77f90"></script>
     <script src="_static/doctools.js?v=9a2dae69"></script>
     <script src="_static/sphinx_highlight.js?v=dc90522c"></script>
     
@@ -26,7 +26,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">dflow.client package</a></li> 
       </ul>
@@ -115,7 +115,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">dflow.client package</a></li> 
       </ul>
diff --git a/dflow.html b/dflow.html
index 41fa8fa0..3c5e7c93 100644
--- a/dflow.html
+++ b/dflow.html
@@ -5,12 +5,12 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="viewport" content="width=device-width, initial-scale=1" />
 
-    <title>dflow package &#8212; dflow 1.8.88
+    <title>dflow package &#8212; dflow 1.8.89
  documentation</title>
     <link rel="stylesheet" type="text/css" href="_static/pygments.css?v=fa44fd50" />
     <link rel="stylesheet" type="text/css" href="_static/classic.css?v=def86cc0" />
     
-    <script src="_static/documentation_options.js?v=768ffb89"></script>
+    <script src="_static/documentation_options.js?v=d2f77f90"></script>
     <script src="_static/doctools.js?v=9a2dae69"></script>
     <script src="_static/sphinx_highlight.js?v=dc90522c"></script>
     
@@ -26,7 +26,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">dflow package</a></li> 
       </ul>
@@ -5659,7 +5659,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">dflow package</a></li> 
       </ul>
diff --git a/dflow.plugins.html b/dflow.plugins.html
index 7f4c6422..83042b05 100644
--- a/dflow.plugins.html
+++ b/dflow.plugins.html
@@ -5,12 +5,12 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="viewport" content="width=device-width, initial-scale=1" />
 
-    <title>dflow.plugins package &#8212; dflow 1.8.88
+    <title>dflow.plugins package &#8212; dflow 1.8.89
  documentation</title>
     <link rel="stylesheet" type="text/css" href="_static/pygments.css?v=fa44fd50" />
     <link rel="stylesheet" type="text/css" href="_static/classic.css?v=def86cc0" />
     
-    <script src="_static/documentation_options.js?v=768ffb89"></script>
+    <script src="_static/documentation_options.js?v=d2f77f90"></script>
     <script src="_static/doctools.js?v=9a2dae69"></script>
     <script src="_static/sphinx_highlight.js?v=dc90522c"></script>
     
@@ -26,7 +26,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">dflow.plugins package</a></li> 
       </ul>
@@ -566,7 +566,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">dflow.plugins package</a></li> 
       </ul>
diff --git a/dflow.python.html b/dflow.python.html
index ba4787bb..98055333 100644
--- a/dflow.python.html
+++ b/dflow.python.html
@@ -5,12 +5,12 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="viewport" content="width=device-width, initial-scale=1" />
 
-    <title>dflow.python package &#8212; dflow 1.8.88
+    <title>dflow.python package &#8212; dflow 1.8.89
  documentation</title>
     <link rel="stylesheet" type="text/css" href="_static/pygments.css?v=fa44fd50" />
     <link rel="stylesheet" type="text/css" href="_static/classic.css?v=def86cc0" />
     
-    <script src="_static/documentation_options.js?v=768ffb89"></script>
+    <script src="_static/documentation_options.js?v=d2f77f90"></script>
     <script src="_static/doctools.js?v=9a2dae69"></script>
     <script src="_static/sphinx_highlight.js?v=dc90522c"></script>
     
@@ -26,7 +26,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">dflow.python package</a></li> 
       </ul>
@@ -1105,7 +1105,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">dflow.python package</a></li> 
       </ul>
diff --git a/genindex.html b/genindex.html
index 55289857..5ebabe51 100644
--- a/genindex.html
+++ b/genindex.html
@@ -4,12 +4,12 @@
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Index &#8212; dflow 1.8.88
+    <title>Index &#8212; dflow 1.8.89
  documentation</title>
     <link rel="stylesheet" type="text/css" href="_static/pygments.css?v=fa44fd50" />
     <link rel="stylesheet" type="text/css" href="_static/classic.css?v=def86cc0" />
     
-    <script src="_static/documentation_options.js?v=768ffb89"></script>
+    <script src="_static/documentation_options.js?v=d2f77f90"></script>
     <script src="_static/doctools.js?v=9a2dae69"></script>
     <script src="_static/sphinx_highlight.js?v=dc90522c"></script>
     
@@ -25,7 +25,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Index</a></li> 
       </ul>
@@ -2473,7 +2473,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Index</a></li> 
       </ul>
diff --git a/index.html b/index.html
index d7b6d8d7..9f339ca2 100644
--- a/index.html
+++ b/index.html
@@ -5,12 +5,12 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="viewport" content="width=device-width, initial-scale=1" />
 
-    <title>Welcome to dflow’s documentation! &#8212; dflow 1.8.88
+    <title>Welcome to dflow’s documentation! &#8212; dflow 1.8.89
  documentation</title>
     <link rel="stylesheet" type="text/css" href="_static/pygments.css?v=fa44fd50" />
     <link rel="stylesheet" type="text/css" href="_static/classic.css?v=def86cc0" />
     
-    <script src="_static/documentation_options.js?v=768ffb89"></script>
+    <script src="_static/documentation_options.js?v=d2f77f90"></script>
     <script src="_static/doctools.js?v=9a2dae69"></script>
     <script src="_static/sphinx_highlight.js?v=dc90522c"></script>
     
@@ -26,7 +26,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="#">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="#">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Welcome to dflow’s documentation!</a></li> 
       </ul>
@@ -96,7 +96,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="#">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="#">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Welcome to dflow’s documentation!</a></li> 
       </ul>
diff --git a/modules.html b/modules.html
index f117e303..ace412ea 100644
--- a/modules.html
+++ b/modules.html
@@ -5,12 +5,12 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="viewport" content="width=device-width, initial-scale=1" />
 
-    <title>src &#8212; dflow 1.8.88
+    <title>src &#8212; dflow 1.8.89
  documentation</title>
     <link rel="stylesheet" type="text/css" href="_static/pygments.css?v=fa44fd50" />
     <link rel="stylesheet" type="text/css" href="_static/classic.css?v=def86cc0" />
     
-    <script src="_static/documentation_options.js?v=768ffb89"></script>
+    <script src="_static/documentation_options.js?v=d2f77f90"></script>
     <script src="_static/doctools.js?v=9a2dae69"></script>
     <script src="_static/sphinx_highlight.js?v=dc90522c"></script>
     
@@ -26,7 +26,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">src</a></li> 
       </ul>
@@ -924,7 +924,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">src</a></li> 
       </ul>
diff --git a/py-modindex.html b/py-modindex.html
index d3d14334..295c80a3 100644
--- a/py-modindex.html
+++ b/py-modindex.html
@@ -4,12 +4,12 @@
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Python Module Index &#8212; dflow 1.8.88
+    <title>Python Module Index &#8212; dflow 1.8.89
  documentation</title>
     <link rel="stylesheet" type="text/css" href="_static/pygments.css?v=fa44fd50" />
     <link rel="stylesheet" type="text/css" href="_static/classic.css?v=def86cc0" />
     
-    <script src="_static/documentation_options.js?v=768ffb89"></script>
+    <script src="_static/documentation_options.js?v=d2f77f90"></script>
     <script src="_static/doctools.js?v=9a2dae69"></script>
     <script src="_static/sphinx_highlight.js?v=dc90522c"></script>
     
@@ -28,7 +28,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="#" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Python Module Index</a></li> 
       </ul>
@@ -238,7 +238,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="#" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Python Module Index</a></li> 
       </ul>
diff --git a/search.html b/search.html
index 85f477d3..32ad3498 100644
--- a/search.html
+++ b/search.html
@@ -4,13 +4,13 @@
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Search &#8212; dflow 1.8.88
+    <title>Search &#8212; dflow 1.8.89
  documentation</title>
     <link rel="stylesheet" type="text/css" href="_static/pygments.css?v=fa44fd50" />
     <link rel="stylesheet" type="text/css" href="_static/classic.css?v=def86cc0" />
     
     
-    <script src="_static/documentation_options.js?v=768ffb89"></script>
+    <script src="_static/documentation_options.js?v=d2f77f90"></script>
     <script src="_static/doctools.js?v=9a2dae69"></script>
     <script src="_static/sphinx_highlight.js?v=dc90522c"></script>
     
@@ -32,7 +32,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Search</a></li> 
       </ul>
@@ -90,7 +90,7 @@ <h3>Navigation</h3>
         <li class="right" >
           <a href="py-modindex.html" title="Python Module Index"
              >modules</a> |</li>
-        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.88
+        <li class="nav-item nav-item-0"><a href="index.html">dflow 1.8.89
  documentation</a> &#187;</li>
         <li class="nav-item nav-item-this"><a href="">Search</a></li> 
       </ul>