'configure' section of prereqs of CPAN meta file is not exported when meta-spec version 2.

With the pod of ExtUtils::MakeMaker, in spite of writing "CONFIGURE_REQUIRES will go into the configure_requires field of your CPAN Meta file", if version 2 is specified as meta-spec, it will not be exported to CPAN Meta file. 

if version 1.4 is specified as meta-spec, it was exported to CPAN Meta file.

Moreover, it is not written to pod of BUILD_REQUIRES that "ExtUtils::MakeMaker => 0" is exported to CPAN Meta file by default.