Apple this week took the unusual step of simultaneously providing developers and the general public with previews of two different editions of both iOS and OS X.

On Monday, Apple seeded developers with the first betas of iOS 9.3 and OS X 10.11.4, then followed up on Thursday by releasing the same builds to the testers who had previously registered with the company’s public preview program.

Handing out previews to developers and the public is nothing new for Apple: It’s offered betas of upcoming updates and upgrades to developers for ages, and to non-developers since mid-2014, when it debuted a public preview for OS X 10.9, aka Mavericks.

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