Here's my example: in JS code, what does // mean? Is it the start of a line comment or the empty regex? The difference between them is nothing. If you could write nothing as _, one would be /_/ and one would be //_
Yes. If we could find some such character that was completely safe all the time, we would have a system of universal templating for all programming languages. ...but we can basically prove to ourselves that we'll never find any completely safe unicode code point to use for the purpose that will never be in conflict with the syntax of any language. ...so are we done for? Nah, we just need an embedding
I feel like somewhere between zero, null, false, a null pointer or an uninstantiated reference we have a few methods to define nothing.