FIX: handle unset nodata and correctly set mask for expanded areas #37
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This PR handles unset nodata a bit better, included when nan values are implicitly used as nodata. The returned array
fill_valueis changed to be the same as nodata.Also, when expanding the grid beyond raster bounds, the outside information is properly masked. For instance, before there is a "halo":
while this is fixed to mask the expanded areas:
