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Just to be clear, who are "we" in this case? :-)

Leaning Technologies (www.leaningtech.com), we make compilers that target WebAssembly and JavaScript.

I am CTO of the company.

Ah, it had appeared maybe you represented Apple or the Safari team in some way with your top-level announcement.

If Apple was going to bother with backwards compatibility, they would have it done before shutting down the old version.

Ah, I see. Thanks! Cool technology you guys have.