Clarify use of _ARRAY_DIMENSIONS
in v0.4 and latest
#218
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As of version 0.4 (and then including
latest
version),_ARRAY_DIMENSIONS
is not a required attribute any more. This PR replaces the relevant "must" with a "may", and adds a clarification about the goal of this attribute (that is, it exists in view of xarray compatibility).Closes #217