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A general description is here.
The functions ‘R_strtod’ and ‘R_atof’ now allow hexadecimal constants
without an exponent, for compatibility with their C99 versions
(PR#18805).
The parser now accepts hexadecimal constants with a decimal point
without an exponent (taken as ‘p0’) as documented in
‘?NumericConstants’ (PR#18819).
The functions ‘R_strtod’ and ‘R_atof’ now allow hexadecimal constants without an exponent, for compatibility with their C99 versions (PR#18805).
The parser now accepts hexadecimal constants with a decimal point without an exponent (taken as ‘p0’) as documented in ‘?NumericConstants’ (PR#18819).