Based on the May 11 meeting:

Remove stretchy from sqrt
Make spacing the same for sqrt, cube root, fourth root (3, 0).

Author: NSoiffer

unicode.xml

@@ -42440,19 +42440,19 @@ Barbara Beeton for the STIX project
             <desc>alias ISOTECH radic</desc>
          </entity>
          <font name="hlcry" pos="112"/>
-         <operator-dictionary priority="845" form="prefix" stretchy="true" lspace="0" rspace="0"/>
+         <operator-dictionary priority="845" form="prefix" lspace="3" rspace="0"/>
          <description unicode="1.1">SQUARE ROOT</description>
       </character>
       <character id="U0221B" dec="8731" type="other" mode="unknown">
          <unicodedata category="Sm" combclass="0" bidi="ON" mirror="Y" mathclass="L"/>
          <mathlatex set="unicode-math">\cuberoot</mathlatex>
-         <operator-dictionary form="prefix" lspace="0" rspace="0" priority="845"/>
+         <operator-dictionary form="prefix" lspace="3" rspace="0" priority="845"/>
          <description unicode="1.1">CUBE ROOT</description>
       </character>
       <character id="U0221C" dec="8732" type="other" mode="unknown">
          <unicodedata category="Sm" combclass="0" bidi="ON" mirror="Y" mathclass="L"/>
          <mathlatex set="unicode-math">\fourthroot</mathlatex>
-         <operator-dictionary form="prefix" lspace="0" rspace="0" priority="845"/>
+         <operator-dictionary form="prefix" lspace="3" rspace="0" priority="845"/>
          <description unicode="1.1">FOURTH ROOT</description>
       </character>
       <character id="U0221D" dec="8733" mode="math" type="relation">