@Override
	public LongField copyField() {
		if (isNull()) {
			LongField copy = new LongField();
			copy.setNull();
			return copy;
		}
		return new LongField(getLongValue());
	}
Construct a long field with an initial value of l.
@param l initial value
@param immutable true if field value is immutable
Ghidra/Framework/DB/src/main/java/db/LongField.java