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A general description is here.
New functions ‘check_package_urls()’ and ‘check_package_dois()’ in package ‘tools’ for checking URLs and DOIs in package sources.
New API function ‘R_mkClosure’. This checks that its arguments are valid and should be used instead of ‘allocSExp(CLOSXP’ followed by ‘SET_FORMALS’, ‘SET_BODY’, and ‘SET_CLOENV’.
New API functions ‘R_ClosureFormals’, ‘R_ClosureBody’, and ‘R_ClosureEnv’ for extrancting closure components. The existing functions ‘R_ClosureExpr’ and ‘R_BytecodeExpr’ have also been added to the API.