I have done quite some implementations now of things in an immutable way. Easy to test, easy to spot bugs, easy to work with. Come back a few months later, and

I have done quite some implementations now of things in an immutable way. Easy to test, easy to spot bugs, easy to work with. Come back a few months later, and purity is removed on many things despite clear comments on the why it is immutable. I welcome any effort to make developers aware of immutability. One simple thing to help here is to have the "mutability: flag marked on every method in MDN.