model

var E_EMPTY_KEY = errors.New("Empty key")

var E_INVALID_DOCUMENT_KEY = errors.New("Invalid document key")

var E_KEY_ALREADY_EXISTS = errors.New("Key already exists")

var E_MISMATCH_TYPE = errors.New("Mismatched type")

var E_NO_SUCH_KEY = errors.New("No such key")

var E_OUT_OF_RANGE = errors.New("Out of range")