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extract_data_from_object considered dangerous

From: Stefan Monnier
Subject: extract_data_from_object considered dangerous
Date: Sun, 22 Sep 2019 09:39:54 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

I was just looking at the calling convention of extract_data_from_object
and it seems intrinsically dangerous:

    It returns a char* into a Lisp_Object without associating it with
    any specific Lisp_Object

In some cases, the Lisp_Object into which the result points is freshly
allocated during the call, so once we return from the function, there is
no Lisp_Object reference to it anywhere any more to keep it from
being GC'd.


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