What special accommodations apply to one involved in circumcision when Tisha B'Av is postponed to Sunday?

Synopsis

When Tisha B'Av falls on Shabbat and is postponed to Sunday, the ba'al habrit should pray Mincha while much of the day remains, may wash, and does not complete the fast since it is his day of celebration.

Early Acharonim
Lenient
Strict
Lesser cited
Major authority

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