Update bundled CPAN::Meta::YAML to 0.011, needed by CPAN::Meta 2.143240
Protect t/basic.t against CPAN::Meta load failure
Protect t/metafile_data.t against failure to load [Parse::]CPAN::Meta
Further protection against 5.6.2 in t/metafile_data.t
Armour remaining tests against 5.6.2
Make _add_requirements_to_meta_* use a ref not listify hash
Use constant for default meta-spec info
Use constants to eliminate repetition in t/metafile_data.t
Specify 2.0 for META.json
Make $mm->metafile_data return hashref
Internal metadata now in 2.0 format
Make test code prettier
sprintf <<TAG bad, replaced with 'TAG'
Refactor metafile-writing to use $MM->stashmeta($text, $file)
Exportable write_file_via_tmp function, put make_type code in MM_Any
Have make_type use inheritance
Use intermediate files to store META.* and *.ppd files
Make t/meta_convert.t data-driven