Linear White
Some naturals knew how to do it. Parks could change and boards could chalk, but some sure knew how to keep their type cool and be back. Refactory practice days were always like that. Cake models, shelves, counter indices, you name it. Far-extending templates to check nobody leaks modulo terms. The manual took a season to read, and this in times where lexing rates are... never mind. As a matter of fact, it only makes it all a bit digestible. Keep your type cool, that's what most often should work.
Substitutions are the crowdy scopes during plateau integration days. All sorts of associative algebra accumulate for nasty garbage collections. It used to be a somewhat messy process until new formats were implemented. Now they just move around. No bound identifiers, no simpleton lambdas that presume nothing is there. It is all automatic now. Quite impressive, to be honest. Nobody would have thought some day we would be levitating damn towards these bound modifiers and just do nothing. Which is what makes substitutions scopes so crowded, coming back to the point. The variety of combinations that these modifiers can provide for maintaining indices is beyond cool. You only need to wait up in line and empty your cache like a good particle for a good number of orthogonal cycles, long enough for your profile to be stamped and be moved upwards in your free energy. Then you can count the world with these modifiers... so, substitutions; one to look out for during plateau integration days.