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A general description is here.
Wrappers now duplicate even a wrapped object that might be shared
before returning a read-only pointer. This prevents cached read-only
pointers from becoming invalid. Reported by Ivan Krylov.
Wrapper objects make sure data pointers remain once obtained remain valid as long as a wrapper object is reachable. Reported by Ivan Krylov.
‘dummy.coef()’ becomes more robust to non-syntactic variable names, fixing PR#18468. Thanks to Bill Dunlap and ‘R Dev Day’ participants Vincent Arel-Bundock, Cynthia Huang, Tina Rozsos and Marina Marinelli.