These operators are like the word "whence": a denser notation that could just as easily be written out in full, in a way more friendly to non-experts in the lan

These operators are like the word "whence": a denser notation that could just as easily be written out in full, in a way more friendly to non-experts in the language - for example, as "from where" - but if you're already an expert thinking in terms of these dense operators, why not write that way? It's only natural.