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A general description is here.
The default method of ‘sequence()’ gets a new option ‘recycle’ to swap between current (not fully recycling) and future behaviour where all three of ‘(nvec, from, by)’ are jointly recycled.
Values returned by active binding functions are now marked as not mutable to prevent unintended mutation in complex assignment operations.
The default method of ‘sequence()’ now allows to fully recycle all three of ‘(nvec, from, by)’ as always documented; with thanks to Mikael Jagan's report and patch in PR#18304. Its behaviour remains back compatible for now, but can be switched to future behaviour via enviroment variable ‘R_sequence_recycle’, or explicit ‘recycle = TRUE’.