Fixes requested in review

Author: dpvc

ts/output/chtml/FontData.ts

@@ -579,7 +579,7 @@ export class ChtmlFontData extends FontData<
       padding: this.padding(HDW as ChtmlCharData, w - HDW[2]),
     };
     if (part === 'ext') {
-      if (w === 0 && options.dx) {
+      if (!w && options.dx) {
         w = 2 * options.dx - 0.06;
       }
       styles[`mjx-stretchy-h${c} > mjx-${part} > mjx-spacer`] = {

ts/output/chtml/Wrappers/mo.ts

@@ -299,7 +299,7 @@ export const ChtmlMo = (function <N, T, D>(): ChtmlMoClass<N, T, D> {
      * @param {string[]} sv        The extender parts variants
      * @param {N[]} dom            The assembly DOM to build
      * @param {number} wh          The delimiter's full width/height
-     * @param {number} ext         The extender character's bearing whitspace
+     * @param {number} ext         The extender character's bearing whitespace
      * @param {string} nl          The string to use between extender characters
      */
     protected createAssembly(
@@ -348,7 +348,7 @@ export const ChtmlMo = (function <N, T, D>(): ChtmlMoClass<N, T, D> {
      * @param {number} n       The unicode character to use
      * @param {string} v       The variant for the character
      * @param {N[]} dom        The DOM assembly
-     * @param {number} W       The extendion width
+     * @param {number} W       The extension width
      * @param {number} Wx      The width of the extender character
      * @param {string} nl      Character to use between extenders
      */