Lazy iris.experimental.stratify.relevel

[bouweandela]

✨ Feature Request

Motivation

Now that python-stratify supports lazy data (SciTools/python-stratify#52) since v0.3, it would be nice if iris.experimental.stratify.relevel supported lazy data too, so the new feature can be used with iris.

At the moment, the input cube is realized here:

iris/lib/iris/experimental/stratify.py

Line 129 in a49b5ac

cube_data, src_data = np.broadcast_arrays(cube.data, src_data)

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[trexfeathers]

@HGWright thoughts?