Hi Laura.
The ellipsis must be spaced (see NC Sec.43b)
Braille the entire numeral, then one blank cell, then the ellipsis.

As for your curiosity question, I have asked my favorite math teacher who says that
repeating decimals should have a horizontal bar (macron) over the repeating numeral/s.
He would interpret 2.46… as a rounded number, with additional digits not shown.

Regardless, we braille what we see, following Nemeth Code spacing rules.

Thank you for your question.
Lindy Walton (answering for Dorothy)