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A general description is here.
‘installChar’ is now remapped in ‘Rinternals.h’ to ‘installTrChar’, of which it has been a wrapper since R 3.6.0. Neither are part of the API, but packages using ‘installChar’ can replace it if they depend on ‘R >= 3.6.2’.
‘installTrChar’ which is nowadays a wrapper for ‘installChar’ is defined in ‘Rinternals.h’. (Neither are part of the API.)
‘conformMethod()’ now works correctly in cases containing a “‘&&’ logic” bug, reported by Henrik Bengtsson. It now creates methods with ‘"missing"’ entries in the signature. Consequently, ‘rematchDefinition()’ is amended to use appropriate ‘.local()’ calls with named arguments where needed.