diff --git a/src/lib/random-draw.hpp b/src/lib/random-draw.hpp
index 108ab4b6e..da54bfc2f 100644
--- a/src/lib/random-draw.hpp
+++ b/src/lib/random-draw.hpp
@@ -189,23 +189,23 @@ namespace lib {
               val *= maxResult_ - org;       // [0 .. m[
               val += org+1;                  // [1 .. m]
               val += CAP_EPSILON;            // round down yet absorb dust
-              return Tar{val};
+              return Tar{floor (val)};
             }
           else// Origin is somewhere within value range
             {//  ==> wrap "negative" part above max
             //       to map 0.0 ⟼ org (≙neutral)
               val *= maxResult_ - minResult_;
               val += org+1;                  // max inclusive but <0 ⟼ org
-              if (val > maxResult_)          // wrap the "negatives"
+              if (val >= maxResult_+1)       // wrap the "negatives"
                 val -= maxResult_+1 - minResult_;
               val += CAP_EPSILON;
-              return Tar{val};
+              return Tar{floor (val)};
             }
-        }
-      
-      static size_t constexpr QUANTISER  = 1 << 8;
+        }                             //----headroom to accommodate low probabilities        
+      static size_t constexpr QUANTISER   = 1 << 4 + util::ilog2 (Tar::maxVal()-Tar::minVal());
       static double constexpr CAP_EPSILON = 1/(2.0 * QUANTISER);
       
+      
       /** @internal draw from source of randomness */
       double
       asRand (size_t hash)
diff --git a/tests/library/random-draw-test.cpp b/tests/library/random-draw-test.cpp
index 86886e5e2..495981130 100644
--- a/tests/library/random-draw-test.cpp
+++ b/tests/library/random-draw-test.cpp
@@ -55,7 +55,7 @@ namespace test{
 //    const Literal THE_END = "all dead and hero got the girl";
     
     struct SymmetricFive
-      : function<Limited<int, 5,-5>(size_t)>
+      : function<Limited<int, 5,-5,0>(size_t)>
       {
         static size_t defaultSrc (size_t hash) { return hash; }
         
@@ -136,9 +136,36 @@ namespace test{
         {
           auto draw = Draw().probability(0.5);
 SHOW_EXPR (int(draw(0)  ));
+SHOW_EXPR (int(draw(63 )));
+SHOW_EXPR (int(draw(64 )));
+SHOW_EXPR (int(draw(70 )));
+SHOW_EXPR (int(draw(72 )));
+SHOW_EXPR (int(draw(82 )));
+SHOW_EXPR (int(draw(83 )));
+SHOW_EXPR (int(draw(84 )));
+SHOW_EXPR (int(draw(85 )));
+SHOW_EXPR (int(draw(86 )));
+SHOW_EXPR (int(draw(87 )));
+SHOW_EXPR (int(draw(88 )));
+SHOW_EXPR (int(draw(89 )));
+SHOW_EXPR (int(draw(90 )));
+SHOW_EXPR (int(draw(91 )));
+SHOW_EXPR (int(draw(92 )));
+SHOW_EXPR (int(draw(93 )));
+SHOW_EXPR (int(draw(94 )));
+SHOW_EXPR (int(draw(95 )));
+SHOW_EXPR (int(draw(96 )));
+SHOW_EXPR (int(draw(97 )));
+SHOW_EXPR (int(draw(102)));
+SHOW_EXPR (int(draw(103)));
+SHOW_EXPR (int(draw(108)));
+SHOW_EXPR (int(draw(109)));
+SHOW_EXPR (int(draw(121)));
+SHOW_EXPR (int(draw(122)));
 SHOW_EXPR (int(draw(127)));
 SHOW_EXPR (int(draw(128)));
-SHOW_EXPR (int(draw(141)));
+SHOW_EXPR (int(draw(129)));
+SHOW_EXPR (int(draw(192)));
 SHOW_EXPR (int(draw(255)));
 SHOW_EXPR (int(draw(256)));
 //          CHECK (draw(0)   == 0);
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index 49cd052e2..14a33b847 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -96728,14 +96728,14 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 </node>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1700577987947" ID="ID_1072243558" MODIFIED="1700578044322" TEXT="Result-Mapping fertigstellen">
-<icon BUILTIN="flag-yellow"/>
-<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1700578049835" ID="ID_1039524348" MODIFIED="1700578324330" TEXT="(optional) Minimal-Wert beachten">
+<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1700577987947" ID="ID_1072243558" MODIFIED="1700591549880" TEXT="Result-Mapping fertigstellen">
 <icon BUILTIN="pencil"/>
+<node COLOR="#338800" CREATED="1700578049835" ID="ID_1039524348" MODIFIED="1700591554997" TEXT="(optional) Minimal-Wert beachten">
+<icon BUILTIN="button_ok"/>
 </node>
 <node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1700578067566" ID="ID_1673296895" MODIFIED="1700578327612" TEXT="(optional) neutralen Wert definieren">
 <icon BUILTIN="pencil"/>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1700578338693" ID="ID_1746695653" MODIFIED="1700578488824" TEXT="Wunsch: neutralen Wert mitten im Wertebereich">
+<node COLOR="#435e98" CREATED="1700578338693" ID="ID_1746695653" MODIFIED="1700591392565" TEXT="Wunsch: neutralen Wert mitten im Wertebereich">
 <richcontent TYPE="NOTE"><html>
   <head>
     
@@ -96749,18 +96749,46 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 </richcontent>
 <icon BUILTIN="yes"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1700578688806" ID="ID_1002441906" MODIFIED="1700578701690" TEXT="brauche anderes Mapping-Layout">
-<icon BUILTIN="flag-yellow"/>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1700578703420" ID="ID_1936439930" MODIFIED="1700578736098" TEXT="erst mal als statischen-Zweig realisieren">
+<node COLOR="#338800" CREATED="1700578688806" ID="ID_1002441906" MODIFIED="1700591389020" TEXT="brauche anderes Mapping-Layout">
+<icon BUILTIN="button_ok"/>
+<node COLOR="#435e98" CREATED="1700578703420" ID="ID_1936439930" MODIFIED="1700591281596" TEXT="erst mal als Fallunterscheidung realisieren">
 <icon BUILTIN="yes"/>
 </node>
-<node CREATED="1700578747462" ID="ID_1744331355" MODIFIED="1700578808542" TEXT="Idee: [0....0[1...max|min...-1]">
+<node COLOR="#435e98" CREATED="1700578747462" ID="ID_1744331355" MODIFIED="1700591285475" TEXT="Idee: [0....0[1...max|min...-1]">
 <icon BUILTIN="idea"/>
 </node>
+<node COLOR="#338800" CREATED="1700591296817" ID="ID_1493490706" MODIFIED="1700591311585" TEXT="mu&#xdf; mit floor() runden">
+<icon BUILTIN="messagebox_warning"/>
+<node CREATED="1700591321621" ID="ID_786179594" MODIFIED="1700591330740" TEXT="sonst Symmetrie-Probleme"/>
+<node CREATED="1700591331493" ID="ID_851466258" MODIFIED="1700591378869">
+<richcontent TYPE="NODE"><html>
+  <head>
+    
+  </head>
+  <body>
+    <p>
+      nat&#252;rliche Rundung <i>is towards zero</i>
+    </p>
+  </body>
+</html>
+</richcontent>
+<richcontent TYPE="NOTE"><html>
+  <head>
+    
+  </head>
+  <body>
+    <p>
+      ...und das ist obendrein <i>implementation defined...</i>
+    </p>
+  </body>
+</html>
+</richcontent>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1700579867534" ID="ID_1525251156" MODIFIED="1700579872321" TEXT="Quantisierung verbessern">
-<icon BUILTIN="flag-yellow"/>
+</node>
+</node>
+<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1700579867534" ID="ID_1525251156" MODIFIED="1700591492624" TEXT="Quantisierung verbessern">
+<icon BUILTIN="pencil"/>
 <node BACKGROUND_COLOR="#f8f1cb" COLOR="#a50125" CREATED="1700579884119" ID="ID_805978365" MODIFIED="1700579898358" TEXT="Probleme mit der Wahrscheinlichkeitsverteilung">
 <icon BUILTIN="messagebox_warning"/>
 <node CREATED="1700580065522" ID="ID_1293962654" MODIFIED="1700580090733" TEXT="f&#xfc;r Zuf&#xe4;lligkeit w&#xe4;re quant &#x2259; card ideal"/>
@@ -96770,12 +96798,20 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 </node>
 <node CREATED="1700580296744" ID="ID_1912245268" MODIFIED="1700580306635" TEXT="auch unebene Teil-Wertbereiche sind problematisch"/>
 </node>
-<node CREATED="1700579942375" ID="ID_1570826487" MODIFIED="1700579973751" TEXT="Quantiser auf 2-log der Kardinalit&#xe4;t aufbauen">
-<node CREATED="1700580399003" ID="ID_1712768640" MODIFIED="1700580402212" TEXT="statische L&#xf6;sung">
+<node COLOR="#338800" CREATED="1700579942375" ID="ID_1570826487" MODIFIED="1700591481064" TEXT="Quantiser auf 2-log der Kardinalit&#xe4;t aufbauen">
+<icon BUILTIN="button_ok"/>
+<node CREATED="1700580399003" ID="ID_1712768640" MODIFIED="1700591474474" TEXT="statische L&#xf6;sung">
+<icon BUILTIN="forward"/>
 <node CREATED="1700580403024" ID="ID_340644857" MODIFIED="1700580414388" TEXT="kann dann nur auf max(Template-Param) aufsetzen"/>
-<node CREATED="1700580415496" ID="ID_241609475" MODIFIED="1700580425235" TEXT="mu&#xdf; mit zus&#xe4;tzlichem Headroom arbeiten"/>
+<node CREATED="1700580415496" ID="ID_241609475" MODIFIED="1700591431909" TEXT="mu&#xdf; mit zus&#xe4;tzlichem Headroom arbeiten">
+<linktarget COLOR="#a9b4c1" DESTINATION="ID_241609475" ENDARROW="Default" ENDINCLINATION="-131;9;" ID="Arrow_ID_404249054" SOURCE="ID_708309999" STARTARROW="None" STARTINCLINATION="77;5;"/>
 </node>
-<node CREATED="1700580428485" ID="ID_209321513" MODIFIED="1700580431707" TEXT="dynamische L&#xf6;sung">
+<node COLOR="#338800" CREATED="1700591450189" ID="ID_1244482845" MODIFIED="1700591469597" TEXT="mein ilog2 kann constexpr sein">
+<icon BUILTIN="idea"/>
+</node>
+</node>
+<node BACKGROUND_COLOR="#d2beaf" COLOR="#5c4d6e" CREATED="1700580428485" ID="ID_209321513" MODIFIED="1700591476960" TEXT="dynamische L&#xf6;sung">
+<icon BUILTIN="hourglass"/>
 <node CREATED="1700580432790" ID="ID_1779483070" MODIFIED="1700580440161" TEXT="w&#xe4;re ein zus&#xe4;tzliches Objektfeld"/>
 <node CREATED="1700580440749" ID="ID_1688731462" MODIFIED="1700580454914" TEXT="m&#xfc;&#xdf;te von jedem Param-Setter mit bedient werden"/>
 <node CREATED="1700580455526" ID="ID_1568213898" MODIFIED="1700580468829" TEXT="w&#xfc;rde den (schnellen) ilogb verwenden"/>
@@ -96794,6 +96830,16 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 </node>
 </node>
 </node>
+<node COLOR="#435e98" CREATED="1700591398164" ID="ID_708309999" MODIFIED="1700591436198" TEXT="Entscheidung: einfache statische L&#xf6;sung">
+<arrowlink DESTINATION="ID_241609475" ENDARROW="Default" ENDINCLINATION="-131;9;" ID="Arrow_ID_404249054" STARTARROW="None" STARTINCLINATION="77;5;"/>
+<icon BUILTIN="yes"/>
+</node>
+<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1700591494047" ID="ID_367849222" MODIFIED="1700591500352" TEXT="Verteilung empirisch untersuchen">
+<icon BUILTIN="flag-pink"/>
+</node>
+</node>
+<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1700591521028" ID="ID_1363297386" MODIFIED="1700591544937" TEXT="DSL-Setter m&#xfc;ssen nun stets konsistente Gesamteinstellung erzeugen">
+<icon BUILTIN="flag-pink"/>
 </node>
 <node COLOR="#338800" CREATED="1700578085130" ID="ID_1160195104" MODIFIED="1700578334393" TEXT="Konsistenz der Definitionen pr&#xfc;fen (statisch)">
 <icon BUILTIN="button_ok"/>
@@ -96811,8 +96857,8 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1700491902622" ID="ID_523469259" MODIFIED="1700577965111" TEXT="soll auch den Proze&#xdf; der Spezialisierung demonstrieren">
 <icon BUILTIN="pencil"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1700491930155" ID="ID_1583745392" MODIFIED="1700577970844" TEXT="numerische Grenzen beleuchten">
-<icon BUILTIN="flag-yellow"/>
+<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1700491930155" ID="ID_1583745392" MODIFIED="1700591561138" TEXT="numerische Grenzen beleuchten">
+<icon BUILTIN="pencil"/>
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1700501979956" ID="ID_571312425" MODIFIED="1700577970844" TEXT="Wirkung des Builder-API dokumentieren">
 <icon BUILTIN="flag-yellow"/>