Switch unixfs.Metadata.MimeType to optional #3458
Merged
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*** THIS IS A BREAKING CHANGE *** as per the google documentation: "Required is forever"
Nevertheless this seems like a good idea at this time: there are no known
producers ( nor consumers ) of MetaData nodes, and the current requirement
of MimeType has an extremely narrow application scope.
This change could very well be rejected in lieu of implementing a new type
of node ( e.g. TheRealMetadata ) in the DataType enum.