Fixed the latter in simplepie/simplepie@545b862
As for the former, I'm not sure it's needed.
True, however it is an API compatibility. I think it's definitely more beneficial to remove it though, so I'll do that.
Fixed in simplepie/simplepie@bc2455d
On second thoughts, remove it completely: simplepie/simplepie@100c6ab
There's no real point including this in init, when it's much easier for a script that's using it to work it out itself.