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kotlinlang

I am updating Effective Kotlin Item 33: Consider factory functions instead of secondary constructors. I changed that completely, may I ask for a feedback?
<https://docs.google.com/document/d/1jN6gltGAN6DMr-_sKoRFStVsaymp-V8ajYvDeVztKOo/edit?usp=sharing>

Personally I use operator fun invoke in companion object, I have read that you don't recommend it but I like them, as you have said, they are fake constructor so I see clearly the intention of them