Trying to save data with a \u0002 crashes LCM

[hahn-kev]

I've got a simple reproduction in my own code. Basically it looks like this:

UndoableUnitOfWorkHelper.Do("create entry", "undo", api.Cache.ServiceLocator.ActionHandler,
    () =>
    {
        var entry = api.Cache.ServiceLocator.GetInstance<ILexEntryFactory>()
            .Create(Guid.NewGuid(),
            api.Cache.ServiceLocator
                .GetInstance<ILangProjectRepository>().Singleton.LexDbOA);
        entry.LexemeFormOA = api.Cache.CreateLexemeForm();
        entry.LexemeFormOA.Form.set_String(0, "te\u0002st");
    });

stack trace:

System.ArgumentException
'�', hexadecimal value 0x02, is an invalid character.
   at System.Xml.XmlUtf8RawTextWriter.InvalidXmlChar(Int32 ch, Byte* pDst, Boolean entitize)
   at System.Xml.XmlUtf8RawTextWriter.WriteElementTextBlock(Char* pSrc, Char* pSrcEnd)
   at System.Xml.XmlUtf8RawTextWriter.WriteString(String text)
   at System.Xml.XmlWellFormedWriter.WriteString(String text)
   at SIL.LCModel.DomainImpl.MultiUnicodeAccessor.ToXml(XmlWriter writer, ILgWritingSystemFactory wsf, Int32 ws, ITsString alternative)
   at SIL.LCModel.DomainImpl.MultiAccessor.ToXMLString(XmlWriter writer)
   at SIL.LCModel.DomainImpl.ReadWriteServices.WriteMultiFoo(XmlWriter writer, String elementName, MultiAccessor multiProperty)
   at SIL.LCModel.DomainImpl.MoForm.ToXMLStringInternal(XmlWriter writer)
   at SIL.LCModel.DomainImpl.MoStemAllomorph.ToXMLStringInternal(XmlWriter writer)
   at SIL.LCModel.DomainImpl.CmObject.SIL.LCModel.ICmObjectInternal.ToXmlBytes()
   at SIL.LCModel.DomainImpl.CmObject.SIL.LCModel.ICmObjectInternal.ToXmlString()
   at SIL.LCModel.Infrastructure.Impl.LcmStateChangeObjectCreation.SetAfterXML()
   at SIL.LCModel.Infrastructure.Impl.UndoableUnitOfWork.SetAfterXml()
   at SIL.LCModel.Infrastructure.Impl.UndoStack.EndUndoTaskCommon(Boolean updateDateModified)
   at SIL.LCModel.Infrastructure.Impl.UndoStack.EndUndoTask()
   at SIL.LCModel.Infrastructure.UndoableUnitOfWorkHelper.EndUndoTask()
   at SIL.LCModel.Infrastructure.UnitOfWorkHelper.Dispose(Boolean disposing)
   at SIL.LCModel.Infrastructure.UnitOfWorkHelper.Dispose()
   at SIL.LCModel.Infrastructure.UndoableUnitOfWorkHelper.Do(String undoText, String redoText, IActionHandler actionHandler, Action task)
   at SIL.LCModel.Infrastructure.UndoableUnitOfWorkHelper.Do(String undoText, String redoText, IActionHandler actionHandler, Action task)
   at SIL.LCModel.Infrastructure.UndoableUnitOfWorkHelper.DoUsingNewOrCurrentUOW(String undoText, String redoText, IActionHandler actionHandler, Action task)
   at FwDataMiniLcmBridge.Api.FwDataMiniLcmApi.CreateEntry(Entry entry) in C:\dev\LexBox\backend\FwLite\FwDataMiniLcmBridge\Api\FwDataMiniLcmApi.cs:line 797

taking a look at LCM I'm not sure where a test for this should even go. Suggestions?