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A general description is here.
‘checkFF()’ (called by ‘R CMD check’ by default) can optionally check foreign function calls for consistency with the registered type and argument count. This is the default for ‘R CMD check --as-cran’ or can be enabled by setting environment variable ‘_R_CHECK_FF_CALLS_’ to ‘registration’.
Functions ‘suppressForeignCheck()’ and ‘dontCheck()’ have been added to allow package authors to suppress false positive reports.
The included version of zlib has been updated to 1.2.8, a bug-fix release.