nil - Replaced link to "No Value" with NULL

nil - Moved category above title in markdown

nil - Added Concepts sub-category to title + Added "value" to title + Added header

nil - Minor Change

nil - Minor Change + Minor Change

nil - Minor Change

nil - Revert grief

nil - Minor Change + Minor Change + Minor Change

nil - Use <example> fields + double quotes

nil - Small signature.

nil - Add examples of nil

nil - No category needed

nil - No change reason was given

nil - No change reason was given