🚀 go-pugleaf

There are actually two issues on this topic, and contributors have
been talking at cross purposes.  First, a check (or cheque) is
whatever the bank is willing to honor.  Most banks make life easier
by using a format they are prepared to honor (but even still reserve
the right not to), but that format is not exclusive.  So, you can
write a check on the side of a cow, and if the bank will honor it,
then it is a valid cheque (true for nearly all banks in every country).
Second, the original article (from "The Polymath") was presumably
concerned with the potential for using PostScript for fraud, which is
where somebody claims to be (or to represent) somebody he isn't.
Here the fraud is make easier by using PostScript (say) to forge
cheques that resemble standard formats.  But really.
Whether or not he knew what he was talking about,
Mr Polymath was really making a point about fraud, and not about
PostScript, magnetic toner, or machine-readable characters.