public final int getVersionNumber() {
		if (isV3) {
			return 3;
		}
		if (isV2) {
			return 2;
		}
		if (isV1) {
			return 1;
		}
		return -1;
	}
Gets the version number of the data type.
@return the version number or -1 if data type doesn't have valid magic number.
Ghidra/Features/MicrosoftCodeAnalyzer/src/main/java/ghidra/app/cmd/data/exceptionhandling/EHFunctionInfoModel.java