The "Not" Keyword

[0xdefea7 10]

Instead of hijacking the other topic any further, I decided to create a new topic for the discussion of the "Not" operator. 

Here is the previous topic for reference:

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How is it that this works perfectly (tested and part of one of my toolsets that hundreds of techs use daily):

$Authentication = InetGetSize("http://wouldntyouliketoknow.com/DeleteThisNow.txt")

If Not $Authentication = 0 Then
    MsgBox(16, "ERROR", "The license for this product has expired.", 5)
    Self_Destruct()
    Exit
EndIf

As we can see, there are no parenthesis there, but it still functions as I expected. This also works as expected, but I feel that the 2 contradict each other:

#include <Constants.au3>

Local $vVar = 'SomeTest'
; This expression before Then is Not True, as $vVar = 'SomeTest' evaluates to True, hence Not True.
If Not ($vVar = 'SomeTest1') Then MsgBox($MB_SYSTEMMODAL, '1', 'This MsgBox won''t display, as $vVar = SomeTest.')
; AutoIt looks at this as (Not $vVar) = 'SomeTest'.
If Not $vVar = 'SomeTest1' Then MsgBox($MB_SYSTEMMODAL, '2', 'This MsgBox won''t display, as $vVar = SomeTest.')

In this second example, the MsgBox with title '2' does not launch, proving that parenthesis are a necessary part of the statement. My question is: What it is about my first example script that makes it work differently than the second example by FireFox?

[FireFox 260]

#include <Constants.au3>

Local $iAuth = 1 ;or any number different from 0

;$iAuth = 0 : False
;Not (False) / Not ($iAuth = 0) : True
If Not $iAuth = 0 Then ;equals to If Not ($iAuth = 0) Then ;this is more easily evaluable
    MsgBox($MB_SYSTEMMODAL, "1", "This MsgBox will display")
EndIf

Local $sVar = "SomeTest"

;$sVar = "SomeTest1" : False
;Not (False) / Not ($sVar = "SomeTest1") : True
If Not ($sVar = "SomeTest1") Then MsgBox($MB_SYSTEMMODAL, "2", "This MsgBox will display")

;Not $sVar : False (because the string is not empty so $sVar is like True in boolean)
;(False) = "SomeTest1" / (Not $sVar) = "SomeTest1" : False
If Not $sVar = "SomeTest1" Then MsgBox($MB_SYSTEMMODAL, "3", "This MsgBox won't display")

All clear? Edited July 21, 2013 by FireFox

[guinness 1,536]

I thought it was pretty clear in the previous thread?!

[0xdefea7 10]

 

I thought it was pretty clear in the previous thread?!

 

This is more clear than the other thread, but I understand where you are coming from. Thank you both for the help

[guinness 1,536]

No problem. Thanks for FireFox for providing examples that demonstrated what I was saying.

Edit: Now off to test v3.3.9.10. Bye!

Edited July 21, 2013 by guinness