Choose folder and count files : ALIAS returned causes problem

Hello,
I have a basic choose folder command and I want to count files contained in the returned folder, I also want to do other things within that folder afterwards.
Alas, Applescript returns what it calls an ALIAS to the" choose folder" command, so that it can't count anything, it can't even give its REAL name ...
How could I get the REAL folder as a result , count its items, get its path, instead of that poorly documented ALIAS I can't make anything with ?
Thanks very much. I've been digging for a while now.

Use a construct such as:
set this_folder to choose folder
tell application "Finder"
count items of (folder this_folder)
end tell
(47355)

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Choose folder and count files : ALIAS returned causes problem

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