Keep 'never' when conjugating to the infinitive instead of adding 'do not'

src/3-three/verbs/api/conjugate/toInfinitive.js

@@ -17,7 +17,8 @@ const toInf = function (vb, parsed) {
   }
   // there is no real way to do this
   // 'i not walk'?  'i walk not'?
-  if (parsed.negative.found) {
+  // 'never' negates the infinitive on its own - 'i never walk'
+  if (parsed.negative.found && !vb.has('never')) {
     if (!vb.has('not')) {
       vb.prepend('not')
     }

tests/three/verbs/toInfinitive.test.js

@@ -59,7 +59,9 @@ test('toInfinitive-phrase:', function (t) {
     ['I will do that', 'I do that'],
     ['I will not do that', 'I do not do that'],
     ["I won't do that", 'I do not do that'],
-    // ['I will never do that', 'I do not do that'],
+    ['I will never do that', 'I never do that'],
+    ['I never do that', 'I never do that'],
+    ['she would never say it', 'she never say it'],
 
     // want-infinitive
     // ['he wants to walk', 'he want to walk'],