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And yet, there's plenty of other, existing, proven languages out there that have had types and those tooling (beyond the 'basic') out there.

I'm not looking for a language battle here, but is inventing your own language based on your favorite language to bring common features from other language really such a good idea?

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If you have an existing codebase in PHP, Hack provides a backwards compatible way to improve the state of things.

I have experienced both cases: a conversion of a large codebase from php to Hack and also a conversion from php to rails. Pick the right tool for the right job.

That sounds like a horrible idea in both cases ...

> I'm not looking for a language battle here, but is inventing your own language based on your favorite language to bring common features from other language really such a good idea?

It worked wonders for C++.

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