- Refactored column objects to contain a ::validate method, for the
validation of incoming data.
- Context.columns is now a vector of one of each column object,
indexed by attribute name, for validation purposes.
- ColDescription::measure did not correctly account for annotation size.
- The macro 'max' was used with expensive arguments, which get evaluated
twice.
- Implemented 'description.default', 'description.count', and
'description.oneline'.
- New 'indent.annotation' for the 'description.default' field format.
