Documented usage of eval in DelayedFunctionScheduler

src/core/DelayedFunctionScheduler.js

@@ -1,3 +1,6 @@
+// Warning: don't add "use strict" to this file. Doing so potentially changes
+// the behavior of user code that does things like setTimeout("var x = 1;")
+// while the mock clock is installed.
 getJasmineRequireObj().DelayedFunctionScheduler = function(j$) {
   function DelayedFunctionScheduler() {
     this.scheduledLookup_ = [];
@@ -23,6 +26,9 @@ getJasmineRequireObj().DelayedFunctionScheduler = function(j$) {
     ) {
       let f;
       if (typeof funcToCall === 'string') {
+        // setTimeout("some code") and setInterval("some code") are legal, if
+        // not recommended. We don't do that ourselves, but user code might.
+        // This allows such code to work when the mock clock is installed.
         f = function() {
           // eslint-disable-next-line no-eval
           return eval(funcToCall);