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Reading this, wishing Facebook's Hack lang was OSS so I could really have a chance to sink my teeth in and compare/contrast these tools.

Edit: Clarity

Facebook's Hack lang is open source, though not publicly documented. This commit points out a lot of the implementation and test files: https://github.com/facebook/hhvm/commit/db9577b1409b74293fd9...

Fascinating! I had no clue.