OBJExporter - exports bigger obj file size that what was loaded into scene

OK it looks like I need to use something like this. Still not perfect but closer to the original. Would be interested in what setting I should be using to leave the original obj file unchanged

var loader = new OBJLoader2();   

loader.setUseIndices(true);

loader.setDisregardNormals(true);

object = loader.parse(objFile);
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