This looks amazingly comprehensive and high quality for a non mainstream language. I wonder how difficult it would be to get something like Rust, Nim, D or Crystal to be able to call the FreePascal ABI and link with this.
For those of us into it, C wasn't never a thing neither we could get the famous rant from Kernighan about the language, as no serious Pascal developer would use the bare bones original ISO standard, just like most C devs never used pure K&R C back then.