Pytest Error when running TestSuite due to MsgPack

[GbotemiB]

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I think the instruction to install msgpack should be included in the installation docs when trying to install zarr from source code for development purpose.

[joshmoore]

Thanks, @GbotemiB. It certainly seems so! However, I do wonder if that's only an issue on Windows, and if so, if we can do something to make it not the case.

[GbotemiB]

It is actually an issue in linux systems as msgpack is not pre installed