org-md-export-as-markdown preserves the ID property of an org buffer, but
for some reason org-org-export-as-org does not. I don't have the "visible
only" option set.

According to the function documentation I should be able to pass a property
list "with external parameters overriding Org default settings", but I
don't know what those default settings are or what parameters will cause
the ID to be exported.

How can I export org headings to org buffers while preserving the ID?
Thanks.