ZipFile allows duplicate entries to be added, but not updated

[ptittof57]

Steps to reproduce

1. Create a new archive with at least two entry with same name
2. Try to call begin update

Expected behavior

I expect to update the file because I can create it with duplicate entry name.

Actual behavior

I can create with duplicate entry but can't update, it's seems this is an issue with ZipFile.cs - Row 1481

		updates_ = new List<ZipUpdate>(entries_.Length);
		foreach (ZipEntry entry in entries_)
		{
			int index = updates_.Count;
			updates_.Add(new ZipUpdate(entry));
			updateIndex_.Add(entry.Name, index);
		}

Version of SharpZipLib

1.1.0

Obtained from (only keep the relevant lines)

• Package installed using NuGet

[piksel]

Ehm, why would you even want this? I'm not even sure what the bug is, shouldn't the library just prevent you from creating the duplicate in the first place?