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The בית חדש in O.C. 168 writes the following:

אלא דלהלכה ודאי במידי דתליא בגירסאות אזלינן לחומרא הכי והכי

In something which is dependent on variant texts we are stringent in both directions.

I have never seen this rule before, and מלתא דלא רמיא עליה דאינש לאו אדעתיה (that which you aren't looking for you don't notice) but I have the sense that in my experience learning halacha this rule is not generally followed.

Do any other poskim follow this rule, and is it sourced somewhere?

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