It would be a nice surprise to come across an article on COBOL that has anything nice to say, much less informative, about the language. One could start with that it's one of a tiny minority of languages based on decimal arithmetic as opposed to binary. This is kind of handy when dealing with money.
Perl 6 uses rational arithmetic by default (or by defining typed variables), which covers the money use case well. And, of course, we have SQL's DECIMAL type in most backends.
And Common Lisp, although it’s not necessarily “default”. (/ 2 3) works as expected, but 1.7 is a float (unfortunately), and not a rational 17/100. Shame, really.
Nothing unfortunate about that. When you work with rationals, it's very easy to grow incredibly large denominators, at which point all arithmetic operations slow to a crawl. Floats are fast and predictable, which is why they're used for most calculations in CL and other languages.