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- All SAPIs will consider a "normal PHP file" as default input, could
it be CLI, mod_php for Apache, or anything else (even FrankenPHP)Agreed, and nothing in the proposal changes that. Existing .php files behave exactly as today through every SAPI. The proposal is additive: a new file type that the engine handles differently, with zero impact on the existing default path.
This is not entirely true, as the handling of *phpc (or whatever
extension you are going to choose) will change. People could already
be using files with that extension. The BC impact is non-zero, though
problems are arguably unlikely.