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A general description is here.
In plain-text help (‘Rd2txt’), an initial newline from an Rd inline \eqn no longer breaks the paragraph.
‘options(scipen = NULL)’ and other invalid values now signal an error instead of invalidating ops relying on a finite integer value. Values outside the range -9 .. 9999 are now warned about and set to a boundary or to the default ‘0’, e.g., in case of an ‘NA’. This also fixes PR#16322.