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@@ -2820,7 +2820,7 @@ may be obtained by subtracting a delta from absolute quantity or absolute quanti
 <p class="admonition-title">Info</p>
 <p>Based on the above assumptions, one of the lines of the below code can't compile:</p>
 <div class="language-cpp highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="n">quantity</span><span class="w"> </span><span class="n">temp1</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">270</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">K</span><span class="p">;</span>
-</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="n">quantity</span><span class="w"> </span><span class="n">temp2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">point</span><span class="o">&lt;</span><span class="n">K</span><span class="o">&gt;</span><span class="p">(</span><span class="mi">300</span><span class="p">);</span><span class="w"> </span>
+</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="n">quantity</span><span class="w"> </span><span class="n">temp2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">point</span><span class="o">&lt;</span><span class="n">K</span><span class="o">&gt;</span><span class="p">(</span><span class="mi">300</span><span class="p">);</span>
 </span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="n">quantity</span><span class="w"> </span><span class="n">temp3</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">temp2</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">temp1</span><span class="p">;</span><span class="w">             </span><span class="c1">// Point</span>
 </span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="c1">// quantity temp4 = temp1 - temp2;          // Compile-time error</span>
 </span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="n">quantity</span><span class="w"> </span><span class="n">temp5</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">temp1</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">temp2</span><span class="p">.</span><span class="n">absolute</span><span class="p">();</span><span class="w">  </span><span class="c1">// Delta</span>
@@ -2841,22 +2841,21 @@ we observe.</p>
 </span><span id="__span-4-8"><a id="__codelineno-4-8" name="__codelineno-4-8" href="#__codelineno-4-8"></a><span class="c1">// point quantities</span>
 </span><span id="__span-4-9"><a id="__codelineno-4-9" name="__codelineno-4-9" href="#__codelineno-4-9"></a><span class="kr">inline</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">floor_level</span><span class="w"> </span><span class="k">final</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">absolute_point_origin</span><span class="o">&lt;</span><span class="n">isq</span><span class="o">::</span><span class="n">height</span><span class="o">&gt;</span><span class="w"> </span><span class="n">floor_level</span><span class="p">;</span>
 </span><span id="__span-4-10"><a id="__codelineno-4-10" name="__codelineno-4-10" href="#__codelineno-4-10"></a><span class="n">quantity</span><span class="o">&lt;</span><span class="n">point</span><span class="o">&lt;</span><span class="n">isq</span><span class="o">::</span><span class="n">height</span><span class="p">[</span><span class="n">cm</span><span class="p">],</span><span class="w"> </span><span class="n">floor_level</span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="n">table_top</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">floor_level</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">;</span>
-</span><span id="__span-4-11"><a id="__codelineno-4-11" name="__codelineno-4-11" href="#__codelineno-4-11"></a><span class="c1">// quantity&lt;point&lt;isq::height[cm]&gt;&gt; glass1_top(glass1_height); // point against nothing (no length)</span>
-</span><span id="__span-4-12"><a id="__codelineno-4-12" name="__codelineno-4-12" href="#__codelineno-4-12"></a>
-</span><span id="__span-4-13"><a id="__codelineno-4-13" name="__codelineno-4-13" href="#__codelineno-4-13"></a><span class="c1">// absolute results</span>
-</span><span id="__span-4-14"><a id="__codelineno-4-14" name="__codelineno-4-14" href="#__codelineno-4-14"></a><span class="n">quantity</span><span class="w"> </span><span class="n">system_height</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">glass1_height</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">glass2_height</span><span class="p">;</span>
-</span><span id="__span-4-15"><a id="__codelineno-4-15" name="__codelineno-4-15" href="#__codelineno-4-15"></a>
-</span><span id="__span-4-16"><a id="__codelineno-4-16" name="__codelineno-4-16" href="#__codelineno-4-16"></a><span class="c1">// delta results</span>
-</span><span id="__span-4-17"><a id="__codelineno-4-17" name="__codelineno-4-17" href="#__codelineno-4-17"></a><span class="n">quantity</span><span class="w"> </span><span class="n">empty_height_res</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">glass1_height</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">fluid_level</span><span class="p">;</span>
-</span><span id="__span-4-18"><a id="__codelineno-4-18" name="__codelineno-4-18" href="#__codelineno-4-18"></a><span class="n">quantity</span><span class="w"> </span><span class="n">glass2_height_res</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">system_height</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">glass1_height</span><span class="p">;</span><span class="w">    </span><span class="c1">// could result in an absolute quantity</span>
-</span><span id="__span-4-19"><a id="__codelineno-4-19" name="__codelineno-4-19" href="#__codelineno-4-19"></a><span class="n">assert</span><span class="p">(</span><span class="n">glass2_height_res</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">glass2_height</span><span class="p">);</span>
-</span><span id="__span-4-20"><a id="__codelineno-4-20" name="__codelineno-4-20" href="#__codelineno-4-20"></a><span class="n">quantity</span><span class="w"> </span><span class="n">height_diff_res</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">glass2_height</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">glass1_height</span><span class="p">;</span><span class="w">      </span><span class="c1">// but this one should definitely return delta</span>
-</span><span id="__span-4-21"><a id="__codelineno-4-21" name="__codelineno-4-21" href="#__codelineno-4-21"></a>
-</span><span id="__span-4-22"><a id="__codelineno-4-22" name="__codelineno-4-22" href="#__codelineno-4-22"></a><span class="c1">// point results</span>
-</span><span id="__span-4-23"><a id="__codelineno-4-23" name="__codelineno-4-23" href="#__codelineno-4-23"></a><span class="n">quantity</span><span class="o">&lt;</span><span class="n">point</span><span class="o">&lt;</span><span class="n">isq</span><span class="o">::</span><span class="n">height</span><span class="p">[</span><span class="n">cm</span><span class="p">],</span><span class="w"> </span><span class="n">floor_level</span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="n">glass1_top</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">table_top</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">glass1_height</span><span class="p">;</span>
-</span><span id="__span-4-24"><a id="__codelineno-4-24" name="__codelineno-4-24" href="#__codelineno-4-24"></a><span class="n">quantity</span><span class="w"> </span><span class="n">point1</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">glass1_top</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">glass1_height</span><span class="p">;</span>
-</span><span id="__span-4-25"><a id="__codelineno-4-25" name="__codelineno-4-25" href="#__codelineno-4-25"></a><span class="n">assert</span><span class="p">(</span><span class="n">point1</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">table_top</span><span class="p">);</span>
-</span><span id="__span-4-26"><a id="__codelineno-4-26" name="__codelineno-4-26" href="#__codelineno-4-26"></a><span class="c1">// quantity point2 = glass1_height - glass1_top;               // no sense - does not compile</span>
+</span><span id="__span-4-11"><a id="__codelineno-4-11" name="__codelineno-4-11" href="#__codelineno-4-11"></a>
+</span><span id="__span-4-12"><a id="__codelineno-4-12" name="__codelineno-4-12" href="#__codelineno-4-12"></a><span class="c1">// absolute results</span>
+</span><span id="__span-4-13"><a id="__codelineno-4-13" name="__codelineno-4-13" href="#__codelineno-4-13"></a><span class="n">quantity</span><span class="w"> </span><span class="n">system_height</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">glass1_height</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">glass2_height</span><span class="p">;</span>
+</span><span id="__span-4-14"><a id="__codelineno-4-14" name="__codelineno-4-14" href="#__codelineno-4-14"></a>
+</span><span id="__span-4-15"><a id="__codelineno-4-15" name="__codelineno-4-15" href="#__codelineno-4-15"></a><span class="c1">// delta results</span>
+</span><span id="__span-4-16"><a id="__codelineno-4-16" name="__codelineno-4-16" href="#__codelineno-4-16"></a><span class="n">quantity</span><span class="w"> </span><span class="n">empty_height_res</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">glass1_height</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">fluid_level</span><span class="p">;</span>
+</span><span id="__span-4-17"><a id="__codelineno-4-17" name="__codelineno-4-17" href="#__codelineno-4-17"></a><span class="n">quantity</span><span class="w"> </span><span class="n">glass2_height_res</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">system_height</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">glass1_height</span><span class="p">;</span><span class="w">    </span><span class="c1">// could result in an absolute quantity</span>
+</span><span id="__span-4-18"><a id="__codelineno-4-18" name="__codelineno-4-18" href="#__codelineno-4-18"></a><span class="n">assert</span><span class="p">(</span><span class="n">glass2_height_res</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">glass2_height</span><span class="p">);</span>
+</span><span id="__span-4-19"><a id="__codelineno-4-19" name="__codelineno-4-19" href="#__codelineno-4-19"></a><span class="n">quantity</span><span class="w"> </span><span class="n">height_diff_res</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">glass2_height</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">glass1_height</span><span class="p">;</span><span class="w">      </span><span class="c1">// but this one should definitely return delta</span>
+</span><span id="__span-4-20"><a id="__codelineno-4-20" name="__codelineno-4-20" href="#__codelineno-4-20"></a>
+</span><span id="__span-4-21"><a id="__codelineno-4-21" name="__codelineno-4-21" href="#__codelineno-4-21"></a><span class="c1">// point results</span>
+</span><span id="__span-4-22"><a id="__codelineno-4-22" name="__codelineno-4-22" href="#__codelineno-4-22"></a><span class="n">quantity</span><span class="o">&lt;</span><span class="n">point</span><span class="o">&lt;</span><span class="n">isq</span><span class="o">::</span><span class="n">height</span><span class="p">[</span><span class="n">cm</span><span class="p">],</span><span class="w"> </span><span class="n">floor_level</span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="n">glass1_top</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">table_top</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">glass1_height</span><span class="p">;</span>
+</span><span id="__span-4-23"><a id="__codelineno-4-23" name="__codelineno-4-23" href="#__codelineno-4-23"></a><span class="n">quantity</span><span class="w"> </span><span class="n">point1</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">glass1_top</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">glass1_height</span><span class="p">;</span>
+</span><span id="__span-4-24"><a id="__codelineno-4-24" name="__codelineno-4-24" href="#__codelineno-4-24"></a><span class="n">assert</span><span class="p">(</span><span class="n">point1</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">table_top</span><span class="p">);</span>
+</span><span id="__span-4-25"><a id="__codelineno-4-25" name="__codelineno-4-25" href="#__codelineno-4-25"></a><span class="c1">// quantity point2 = glass1_height - glass1_top;               // no sense - does not compile</span>
 </span></code></pre></div>
 <h2 id="new-opportunities">New opportunities<a class="headerlink" href="#new-opportunities" title="Permanent link">&para;</a></h2>
 <p>The new syntax simplifies API as one <code>quantity</code> class template will now serve all quantity