Bug 205782 Excel can't process big data which type is Decimal.
engine/org.eclipse.birt.report.engine.emitter.prototype.excel/src/org/eclipse/birt/report/engine/emitter/excel/Data.java
{
	private static final long serialVersionUID = -316995334044186083L;
	private static int ID = 0;
	public static final String DATE = "DATE";
	public static final String NUMBER = "NUMBER";
	public static final String STRING = "STRING";
	public static final String CALENDAR = "CALENDAR";
	public static final String CDATETIME = "CDATETIME";
	
    Object txt;
    int styleId, id;
    
    String datatype = Data.STRING;
    
	StyleEntry style;
	Span span;
	
	Rule rule;
	HyperlinkDef url;
	boolean isTxtData = true;
	public Data(final Object txt, final String datatype)
	{
	   this(txt, null, datatype);
	}
	
	public Data( final Object txt, final StyleEntry s, final String datatype )
	{
		this.txt = txt;