[boost] boost-test, why is there no DOUBLES_EQUAL?

Hello, I am a regular user of the boost test library, having used CPPunit before. I miss the following macro: BOOST_CHECK_DOUBLES_EQUAL(first, second, absolute_tolerance); which would check whether "std::fabs(first-second) <= absolute_tolerance" is true. It seems the boost test library does not support it, and instead forces/encourages users to use BOOST_CHECK_CLOSE(first, second, percent_relative_tolerance); The above macro does not really make sense in my application, I really need to check for absolute tolerances, irrespectively of the magnitude of the numbers. CPPunit has this feature as DOUBLES_EQUAL. Would you consider adding this? Thanks, Sebastian