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A general description is here.
New function ‘bitstring()’ as a user-friendly wrapper around ‘intToBits()’, etc.
New experimental function ‘R_GetBindingType’ to support inspecting environment bindings without forcing delayed or active bindings. New functions ‘R_MakeDelayedBinding’, ‘R_MakeForcedBinding’ and ‘R_MakeMissingBinding’ for creating bindings. For examining features of bindings: ‘R_ForcedBindingExpression’, ‘R_DelayedBindingExpression’, and ‘R_DelayedBindingEnvironment’ (PR#18928). New functions for examning ‘...’ bindings in environments: ‘R_DotsLength’, ‘R_DotsNames’, ‘R_DotsElt’, ‘R_GetDotType’, ‘R_DotDelayedExpression’, ‘R_DotDelayedEnvironment’, and ‘R_DotForcedExpression’ (PR#18928).