Large roman numerals

[stone-zeng]

\int_to_roman:n { 5000 } gives "mmmmm", but in the "standard" roman numerals use overbar such as \bar{v}. Of course it may not be permitted in the pure-text mode. So please consider to add a notice that the integer inside \int_to_roman:n should not larger than 4999, otherwise the result may not be so correct.

[eg9]

\int_to_roman:n is an expl3 wrapper around \romannumeral (allowing integer expressions). It is not really for printing arbitrary numbers in Roman notation, which pertains to formatting and is out of the scope of expl3.

It might be useful to add a short note about this in the documentation.

[josephwright]

As @eg9 says, this is a number conversion function: I don't think one could actually store the bar notation in a portable way.