Is there a term for a person who takes everything like it’s written in stone? [duplicate]

I would describe such a person as fastidious

giving too much attention to small details and wanting everything to be correct and perfect

unyielding

(of a person or their behavior) unlikely to be swayed; resolute. Lexico

You describe someone as unyielding when they have very strong, fixed ideas about something and are unlikely to change their mind. Collins

Miss Kuhlman said that initially waiting for their turn was rather chaotic, but after the first couple of weeks, they understood that waiting politely for their turn was the only way they would be able to ride the tricycle. Miss Kuhlman was unyielding about her rules. B. E. Lithander; Life's Pages—A Story Worth Sharing (2010)

He thought as a judge down to the time when he had made up his mind, and after that his obstinacy was unyielding. The American Law Review, Vol. 25 p.25 (1891)