FWIW, it doesn't even compile on older versions (tried several,
going back to v5.005_03 — same error as in v5.8).
BTW, I think the "legacy" is referring to the subroutine do_https4 itself,
not to the weird usage of splice within it... so you're probably okay
simply removing that piece of code.
Update: another indication that this code has never really been in
use is that if the idea is to modify the argument list prior to calling
the wrapped do_httpx4, it would have to be called as &do_httpx4 to
actually make @_ visible to that subroutine...
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