Trigraphs are handled by the preprocessor, so if you’re not handling that, then that’s fine. Digraphs are handled by the tokenizer, however.

Are digraphs and trigraphs deprecated?

Did you reference the standard?

As mentioned in the article, this concerns release mode, which already does not have symbols by default for user code. It does have symbols for the standard library code, however, due to how the binaries for the standard library are shipped (i.e. with symbols only). This change simply also removes standard library symbols.

If you need symbols, you can use default debugging build, or if you need both compiler optimizations and debugging symbols you can create a custom profile that inherets from release with debug = true. The second you already need to do to get full debugging symbols right now, so this isn’t really much of a change from a workflow standpoint.

The last draft before publication: https://j3-fortran.org/doc/year/23/23-007r1.pdf

This is a cool idea. There are other programming languages that have libraries that expose similar behavior. For instance, Rust has the uom crate, Haskell has the units package, and C++ has the header only library SI.

But there is something to be said about it being built in.

If the streching is so small as to be unnoticable (and I agree it’s pretty subtle) then I also don’t really understand the benefit.

Typically, the idea behind this sort of design is that it should be unnoticeable. The motivation is that, with other monospace fonts, the differences in character width, along with the inconsistent spacing and line thicknesses are both noticable and distracting. Some of this badness is avoidable, and this is what this font attempts.

and yeah that height difference is really weird. That almost seems like a bug.

I’ve been informed, (and had to double check because I didn’t believe it,) that the two "i"s are actually the exact same height. The first looking larger than the second is an optical illusion. Font design is hard.

True, they are the exact same height. Holy optical illusion, Batman!

I suppose this is part of what makes font design so difficult.

Here’s your code example in the editor. I don’t personally think the difference between the 'm’s is super noticable. But what did strike me a lot more is the difference in height between the two 'i’s in the first line. I think that difference is pretty bad.

easily improve … C++

I assure you that there is absolutely nothing easy about the C++ standardization process, lol.