Who is Ireneo Funes from Ficciones and what is their importance?

Ireneo is a young man, who suffered a tragic accident. As a result of his accident and lengthy recuperation, Ireneo discovers he has many gifts. These gifts include the ability to observe and memorize everything around him, to know the time no matter the hour, and the ability to remember everything, no matter how minute. These gifts cause Ireneo to age before his time. He dies at the age of nineteen.