a non-cast ivalue ref?
https://m.youtube.com/watch?v=IK4GhjmSC6w
https://m.youtube.com/watch?v=XS2JddPq7GQ
https://m.youtube.com/watch?v=tH0Z2OvHAd8
And your go-to eventual reference, https://en.cppreference.com/w/cpp/language/value_category
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