setupKey method
Implementation
List<K> setupKey(K key) {
var expandKeys = expandedKeys(key).expand(normalizedKeys).toList();
var keysNorm = [...normalizedKeys(key), ...expandKeys].toDistinctList();
if (keysNorm.isEmpty) return keysNorm;
_keysMapping[key] = key;
_keysUnmapping[key] = keysNorm.first;
for (var kNorm in keysNorm) {
_keysMapping[kNorm] = key;
}
return keysNorm;
}