Re: Should lexical-let use let in the situation lexical-binding is t ?

[Richard Stallman]

    This said, there can be good reasons to force a lexical binding, when
    you fear that the code might be run in a context where the variable
    might happen to be defvar'd.

I am very skeptical of that claim.  It seems to me that if your local
variable is defvar'd by some other code, that is a kind of name
collision and that other code should use a different name which isn't
likely to collide with local variables.

-- 
Dr Richard Stallman
President, Free Software Foundation
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