New returns an empty Map.

use for reading from the config.

use for default values.

Priority levels for AddGetter.

Priority levels for AddGetter.

Map provides a wrapper around multiple Setter and Getter interfaces.

Getter provides an interface to get config items.

Mapper provides an interface to read and write config.

Setter provides an interface to set config items.

Priority of getters.

Simple is a simple Mapper for testing.