Return type $this&Iface must transfer the Iface to the invoked object #7385
Description
Feature request
$v->assertHasII() must have the same effect as $v = $v->assertHasII() when the return type is always instance of $this
https://phpstan.org/r/53ba9b04-685e-404c-ba77-a9616ca75ace
Line Error
22 Dumped type: Cl
24 Dumped type: Cl&II
30 Dumped type: Cl
-32 Dumped type: Cl
+32 Dumped type: Cl&II
37 Dumped type: $this(Cl)
-40 Dumped type: $this(Cl)
+40 Dumped type: $this(Cl&II)