I don't know what your evidence is supported by.
My evidence is supported by the text of the 1956 ACT, the interpretations of this act by the highest legal minds and its unchallenged application up to the time of the GFA.
Irish Statute Book
Citizenship
6.—(1) Every person born in Ireland is an Irish citizen from birth.
Formalities to be complied with in certain cases
7.—(1) Pending the re-integration of the national territory, subsection (1) of section 6 shall not apply to a person, not otherwise an Irish citizen, born in Northern Ireland on or after the 6th December, 1922, unless, in the prescribed manner, that person, if of full age, declares himself to be an Irish citizen or, if he is not of full age, his parent or guardian declares him to be an Irish citizen. In any such case, the subsection shall be deemed to apply to him from birth.
(2) Neither subsection (2) nor (4) of section 6 shall confer Irish citizenship on a person born outside Ireland if the father or mother through whom he derives citizenship was also born outside Ireland, unless—
( a ) that person's birth is registered under section 27, or
( b ) his father or mother, as the case may be, was at the time of his birth resident abroad in the public service.
As can be read, a declaration of citizenship had to be made. In this declaration was the text to uphold the constitution. In the Dept of For. Affairs, in the application for passport for NI born, this extra requirement was mandatory.
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