I was wandering what is considered the "nicest" (or, right) way to
define short macros or aliases. Say, something like
\ie ⇒ i.\,e.
As this is ment for document level, I am tempted to use
\NewDocumentCommand. But this word is longer than the whole code of the
macro itself, that blows some simple code really up. On the other hand,
using \def would be very short but is not LaTeX3-ish. \cs_new:Nn doesn't
let me define something without a : at the end. Or would a \tl_new be a