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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.
‘rmultinom’ has been documented in ‘Writing R Extensions’ §6 so is now part of the R API.
‘qbeta(.001, .9, .009)’ and similar cases now converge correctly thanks to Ben Bolker's report in PR#17746.