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I never used activeDocument.saved yet. For documents with changes it prints true, for unchanged documents false. Problem is that just created (not saved yet) document with no changes also is seen as saved 
(just for information)
Ps. recently I had very similar situation that only there came to me I can do was to create empty suspendHistory function.
Okey. I understand if Action Manager deletes all guides at once (I saw it running your fantastic snippet) then .removeAll() method (that deletes singly) is not based on AM code. So conclusion is, not everything what we have in DOM comes from AM, right? Well how is that .removeAll() methos recogines single lines while AM doesn't?
Whatever is answer it should be easy to delete certain line (one of many) by rewritting binaries. I don't have time to do it now, but maybe one day when someone needs... 
btw, how to use that: alert(get_prop_value("document", null, "numberOfGuides"))
I think RemoveAll() is implemented approximately like this
while(activeDocument.guides.length) activeDocument.guides[0].remove();
By the way, I was mistaken about the fact that you can not delete one guide through AM. It is possible so
var r = new ActionReference();
r.putIndex( charIDToTypeID( "Gd " ), 1 );
var d = new ActionDescriptor();
d.putReference( charIDToTypeID( "null" ), r );
executeAction( charIDToTypeID( "Dlt " ), d, DialogModes.NO );
Strangely, but this action does not cause History State to appear and is not recorded. A bug?
P.S. I gave you the code for get_prop_value() Modifying Levels Adjustment Layer? Or not?
Strange is that many times when I wanted to select other than selected item (like for ex. some layer) I didn't use:
(ref1 = new ActionReference()).putEnumerated(sTT('good'), sTT('ordinal'), sTT('allEnum'))
but now for some reason I simply forget to try the same with guides:
(ref1 = new ActionReference()).putIndex(sTT('good'), 1)
Fortunately you noticed so obvious thing
I don't think it's a bug. Guides are extra stuff, not part of your artLayer like channels. But pathItems are extra stuff too and they are recorded. Anyway Guides are more like accessory stuff.
Yes I'm sorry I had no time to focus on that other topic yet enough, so I simply forgot
And I think this is a bug, since it is impossible to perform undo.
The same situation with the annotations is working fine.
var r = new ActionReference();
r.putIndex( stringIDToTypeID( "annotation" ), 1 );
var d = new ActionDescriptor();
d.putReference( charIDToTypeID( "null" ), r );
executeAction( charIDToTypeID( "Dlt " ), d, DialogModes.NO );
P.S. Do not you bother with sTT ('good')?
Why not use sTT ('guide')?
Yes, then you are right. Annotations are possibly same kind of accessory like guides are. They should work the same way.
That there is used 'good', not 'guide' is because it was converted so by my 'AM Replacement' script (Clean SL) that changes charIDToTypeID to stringIDToTypeID.
I noticed it changes 'Gd ' to first String it finds (alphabetically) so 'good'. 'u' in 'guide' is greater than 'o' in 'good', so it stops at 'good', however for some reason it still works 😕
That's not single case it happens. I find once for a while other uncorrect convertions that works as well.
I could ask you the same question why did you use 'paint' instead of 'point' in your code:
var d2 = new ActionDescriptor()
var anchor = new ActionDescriptor()
anchor.putUnitDouble(stringIDToTypeID("horizontal"), charIDToTypeID("#Rlt"), pp.anchor[0])
anchor.putUnitDouble(stringIDToTypeID("vertical"), charIDToTypeID("#Rlt"), pp.anchor[1])
d2.putObject(stringIDToTypeID("anchor"), stringIDToTypeID("paint"), anchor)
So like you see there is 'paint' (that works), but correctly should be 'point' (what works too) 
Check that in this topic: Add subpath to existing path
Here's my code I created (before I found yours - so that is not based on code from that topic), where my converter used 'paint' instead of 'point' too (as 'a' ASCII character is smaller than 'o'):
function subPaths() {function lar(v) {function pos(v1, v2) {
(dsc5 = new ActionDescriptor()).putUnitDouble(sTT('horizontal'),
sTT('pixelsUnit' ), v1[0]), dsc5.putUnitDouble(sTT('vertical'),
sTT('pixelsUnit'), v1[1]), dsc4.putObject(sTT(v2), sTT('paint'), dsc5)
}
dsc4 = new ActionDescriptor(), pos(v[0], 'backward'), pos(v[1], 'anchor')
pos(v[2], 'forward'), lst3.putObject(sTT('null'), dsc4)
}
lst3 = new ActionList(); for(i = 0; i < baf.length; i++) lar(baf);
(dsc3 = new ActionDescriptor()).putBoolean(sTT('closedSubpath'), true)
dsc3.putList(sTT('points'), lst3); (lst2 = new ActionList()).putObject(sTT('null'), dsc3);
(dsc2 = new ActionDescriptor()).putList(sTT('subpathListKey'), lst2); return dsc2
}
a=[t = 300, t], b=[f = 400, t], c=[f, f], d=[t, f]
function sTT(v) {return stringIDToTypeID(v)}
baf = [[a, a, a], [b, b, b], [c, c, c], [d, d, d]];
(ref1 = new ActionReference()).putProperty(sTT('path'), sTT('workPath'));
(dsc1 = new ActionDescriptor()).putReference(sTT('null'), ref1);
(lst1 = new ActionList()).putObject(sTT('pathComponent'), subPaths())
dsc1.putList(sTT('to'), lst1), executeAction(sTT('set'), dsc1, DialogModes.NO)
End of 4th line:
sTT('pixelsUnit'), v1[1]), dsc4.putObject(sTT(v2), sTT('paint'), dsc5) // sTT('point')
How that happened you used 'paint', not 'point' (that is equivalent to 4-char ID 'Pnt ')? Do you use some wrongly working converter too like me? (however I have noticed you prefer to use - working faster? - Chars instead of Strings in your scripts)
Did you use some brute force method to find it all - how you did you could find duplicated strings - I was able only first 
["grain", "green", 1198681632, "Grn "] / does 'green' work finally in new release? Did not in previous Ps's only 'grain' work?
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