Removed a misleading comment
The comment said that stack[-pointer:] is same as reversed(stack[0:pointer]). This is not the case. For example:
```
stack = [1, 2, 3, 4, 5]
stack[-3:]  # this is [3, 4, 5]
reversed(stack[0:3])  # this is [3, 2, 1]
```
@@ -194,7 +194,7 @@ def apply_stack(initial_msg):
default_process_message(msg)
- for frame in stack[-pointer:]: # reversed(stack[0:pointer])
+ for frame in stack[-pointer:]:
frame._postprocess_message(msg)
cont = msg["continuation"]
