Re: Why is lexical-binding's global value ignored?

[abq]

tomas wrote:
> I think it's backward compatibility, mainly. Files with no explicit
> lexical binding setting (may) contain code which expects dynamic
> binding and would break.

As I mentioned, the global value of lexical-binding defaults to nil. 
This is the case in Emacs 24 through 28, and obviously will be in 29 
too. Therefore, even if the global value were honored in 29 and future 
versions, files with no explicit setting would continue to get dynamic 
binding, as they expect. They won't break.

In order to break anything, you would have to do so explicitly, via 
(setq-default lexical-binding t).