What toml library to use.
Let's look at the performance section of this random one.
"Most operations should not be shockingly slow."
Lol.
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It's just for a configuration file though.
It doesn't make much of a difference how long it takes to process it, so long as it isn't perceptible to humans.
If a higher being who is more than human uses this thing I'm writing, I can only apologize for this.