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Someone found a flaw in their open source code and when they contacted the IOTA team about it, the team said it was no mistake and that they use a secret line of code (this one not open source) to correct it.

This goes against the whole reason people use open source code. People make their code open source so that others can use it, improve upon it, and apply it to different things. But IOTA doesn't want that apparently...

Here is an article that talks about it from an Ethereum dev