Grouped list, add a record with same ID but different group.

Given a list grouped by property "type", ordered by property type and id.



My store contains

Code:

---

{id:1,name:'Peter',type:'Person'}

{id:2,name:'Alex',type:'Person'},

{id:3,name:'Count Dracula',type:'Unperson'}

---

The result is the list

Code:

---

Person

o Peter

o Alex

Unperson

o Count Dracula

---

I add a record to that store:

Code:

---

{id:2,name:'Alex',type:'Unperson'}

---

I would expect:

Code:

---

Person

o Peter

Unperson

o Alex

o Count Dracula

---

but I get

Code:

---

Person

o Peter

o Alex

Unperson

o Count Dracula

---

Let's now reload the same store with the following data:

Code:

---

{id:1,name:'Peter',type:'Person'}

{id:2,name:'Alex',type:'Unperson'},

{id:3,name:'Count Dracula',type:'Unperson'}

---

I now add to the store:

Code:

---

{id:2,name:'Alex',type:'Person'}

---

I would expect:

Code:

---

Person

o Peter

o Alex

Unperson

o Count Dracula

---

but I get

Code:

---

Person

o Peter

Person

o Alex

o Count Dracula

---

Is this behaviour indended, or what did I overlook?