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A general description is here.
The long-deprecated and non-API entry point ‘call_R’ is only declared
_pro tem_ in ‘R_ext/RS.h’ (included by ‘R.h’) if
‘DECLARE_LEGACY_CALL_R’ is defined before that header is included.
The long-deprecated, undocumented and non-API entry point ‘call_R’ is no longer declared in ‘R_ext/RS.h’ (included by ‘R.h’).
‘model.weights()’ and ‘model.offset()’ more carefully extract their model components, thanks to Ben Bolker and Tim Taylor's R-devel post.