Hack provides an option that no other popular member of the MPDPL family has: the ability to introduce a type system after initial development, and only in the parts of the system where the value exceeds the cost.
Taking PHP Seriously
Keith Adams
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Hack provides an option that no other popular member of the MPDPL family has: the ability to introduce a type system after initial development, and only in the parts of the system where the value exceeds the cost.

Actually no. Thanks to you I played with Hack and it strikes me as very similar to what https://kotlinlang.org/ can bring to existing java codebase and libraries. And I mean that as a compliment.

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