Encode collection wrapper element name via XmlNameProcessor - #918
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XmlNameProcessor
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Collection wrapper element name skips the
XmlNameProcessorstartWrappedValue()writes the wrapper element straight to the Stax writer, so with a non-passthrough processor the wrapper name comes out verbatim while the wrapped item names (which go throughwriteName()->encodeContentName()) are encoded. Since the reader decodes every element name, a default wrappedListserialized withnewAlwaysOnBase64Processor()then throwsStreamReadExceptionon read (the raw wrapper name is not valid base64), and a wrapper name holding an XML-invalid character such as a space emits non-well-formed XML. Routing the wrapper name throughencodeContentName()first keeps it symmetric with the item names; passthrough output is unchanged.