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Magic Enum C++
Static reflection for enums (to string, from string, iteration) for modern C++, work with any enum type without any macro or boilerplate code
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There are already several working, well-known and used hacks mechanisms available to reflect on enums. For example, magic enum, wise enum, Boost.Describe, and so on.
https://embark.dev/ is a major player in the rust ecosystem right now. They look like they are aiming for more of a startup feel rather than an indie one.
My little toy engine I made had code for this. I had to rely on gnu extensions, but it worked ok. Then I would define them in lua from the c++ code so I could use them easily. https://github.com/floomby/Equinox-Engine/blob/main/enum_helper.hpp
On the Rust front, the ecosystem is still in its infancy but rapidly growing. r/rust_gamedev would be a good place to go to see at a glance what the current state of things is.
Introducing malloc() and pthreads makes a large difference in binary size, from what I've been able to tell. Those come out of libC and POSIX, technically, but you need them to use a real STL (except for pthreads on Windows). My bigger concern is the invisible overhead that they introduce more than the binary size, which is why I'm working on technology to program C++ without them.
There are already several working, well-known and used hacks mechanisms available to reflect on enums. For example, magic enum, wise enum, Boost.Describe, and so on.