What happened to Property Behaviours SE-0030

The Decision Notes state:

The core team believes that property behaviors are a worthwhile feature for Swift, but it’s clear from the discussion that we as a community have not yet converged on a design we are willing to commit to. It is therefore too early to accept a proposal for this feature. We encourage the author to continue refining the design and providing new proposal drafts for discussion, and will schedule another public review when it looks like we are closer to converging on a single design.

But this was in 2016, so has there been any progress on it since?

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I think the answer will be that it wasn't a priority since then and it would require a lot of designing discussion to make things right and extensible in the future. However I miss it as well. I personally need an alternative to missing lazy let.