[Avodah] KSA, MB, AhS, Chayei Adam and other codes

[Zev Sero]

Micha Berger wrote:
 
> Yes, according to the Gra, violating Mes' Soferim is like violating any
> other conclusion of Chazal, which he considers a show-stopping
> consideration.

Question: Did the GRA believe that Mes' Soferim was actually written
before chatimat hatalmud?  Or did he consider its authors among Chazal
for another reason?

-- 
Zev Sero               Something has gone seriously awry with this Court's
zev at sero.name          interpretation of the Constitution.
                       	                          - Clarence Thomas