Worth noting that Go has this too in the form of struct tags on fields, which people use to define behaviour like reading from a db or json, and which have simi

Worth noting that Go has this too in the form of struct tags on fields, which people use to define behaviour like reading from a db or json, and which have similar pseudo-languages stuffed into strings - people are even trying to extend them into structured data now. Madness. It's quite possible to avoid them of course and I prefer just to use code to instantiate objects rather than learning yet another configuration language attached to fields.