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The check for a negative long needs to be done
differently; this is really depending too much
on internal details.

Note also that the _long_as_ssize_t() function
was introduced to support both long_index() and
_PyLong_AsSsize_t().  Now that the former is
removed, the situation looks slightly strange,
because _long_as_ssize_t() is doing a bit too
much work for its one remaining caller.
That's why somehow reusing _long_as_ssize_t()
from abstract.c would look cleaner to me.