Odd suspendHistory behavioud

I stumbled upon some strange behaviour of suspendHistory.

In JSX, there are, basically, 2 ways of writing code that I know.

1. When you write public named functions that are later called through the CSInterface bridge.

Like:

myFunc = function() {
  //do something
}

2. To make the code a bit more clean I started making kind-of-classes to have common pieces together. For example, a class for all layer-related scripts, or all channel-related scripts.

Like:

function LayersTools() {
   this.publicMethod = function() {
   }
   function privateMethod() { ... }
}

Now as it turned out, calling

app.activeDocument.suspendHistory("Test", "myFunc()")

works fine

but

app.activeDocument.suspendHistory("Test", "new LayersTools().publicMethod()")

doesn't suspend internal code of `publicMethod()`

So if, for example, my publicMethod() creates a new layer, this entry will not be suspended.

And if I re-write this as

LayerTools_publicMethod() { //create new layer }

and call it

app.activeDocument.suspendHistory("Test", "LayerTools_publicMethod()")

it will work just fine, all entries will be with suspended history

Does anybody has any insight on this?