BUG: Ensure numpy masked arrays stay masked after projection #1103
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As noted in #1102, projecting numpy masked arrays returned numpy masked
arrays in the 2.x series of pyproj. This behaviour changed in commit
4ab3ff7 as part of the 3.x series, where a "plain" numpy ndarray was returned. The change
implemented here ensures that projecting numpy masked arrays returns
masked arrays as was previously the case.
I'm fairly sure that the fix I've implemented here does actually fix the issue mentioned in #1102; nevertheless, please review my changes carefully as I'm not very familiar with this codebase.
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