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A general description is here.
The definition of ‘DL_FUNC’ in ‘R_ext/Rdynload.h’ has been changed to be fully C-compliant. This means that functions loaded _via_ for example ‘R_GetCCallable’ need to be cast to an appopriate type if they have any arguments.
The ‘as.POSIXlt(<POSIXlt>)’ and ‘as.POSIXct(<POSIXct>)’ default methods now do obey their ‘tz’ argument, also in this case.
‘as.character(<POSIXt>)’ now behaves more in line with the methods for atomic vectors such as numbers, and is no longer influenced by ‘options()’. Ditto for ‘as.character(<Date>)’. The ‘as.character()’ method gets arguments ‘digits’ and ‘OutDec’ with defaults _not_ depending on ‘options()’. Use of ‘as.character(*, format = .)’ now warns.