Interesting, candid discussion on when you might want to change the class of an object, focusing on Common Lisp:
miniblog.
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Are users more tolerant of a slow programming language if it has good multithreading or green threads?
I'd be willing to use a PL with good ergonomics that runs at 0.5x speed if it's easy to saturate multiple threads.
(PLs focusing on single-threaded performance are common!)
Too many languages introduce themselves as e.g. "Foo is a statically typed functional language", focusing on the basic characteristics.
I'd rather learn why Foo is special. What is Foo great for? Get me excited about what I could do with it!
I'm a fan of simple issue trackers. A description, comments, and maybe a small integration with something.
Given this, perhaps it makes sense to build your own? You get a bespoke solution, and focusing on your main project prevents feature creep.