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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).
‘R CMD build’ now installs packages providing their own vignette engine (PR#18191). Patch by Paul Smith.
‘Ops’ group (‘Arith’, ‘Compare’, ...) methods for matrix-‘"ts"’ now do return (zero length) matrices even when the two series do not overlap; a very partial fix of PR#18972, which is to be fully addressed later.