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                                            Xiao

`ByteMaskedArray.mask_as_bool` returns inverted validity for `valid_when=False`

> You are welcome to submit the PRs with fixes. Please let us know if you would like to contribute and need help with it. Thank you! Got it! Also...

BUG: `scipy.cluster.vq.kmeans` returns a distortion value from a different iteration than the final centroids

I tried fixing the seed: ```python from scipy.cluster.vq import kmeans, vq, whiten import numpy as np rows = [[8., 1e-5, 1e-5, 1e-5]] + [[1e-5]*4]*51 + [[0., 1e-5, 1e-5, 1e-5]] obs...

BUG: interpolate: `RectBivariateSpline.partial_derivative` rejects valid x-derivative orders when `kx > ky`

Thanks for the pointer on `NdBSpline.derivative`. I'll look into it. > @T90REAL how are you finding these corner cases, is this some usage or is it an automated tester or...

`chordal_cycle_graph` returns a 6-regular multigraph with self-loops, not the documented 3-regular graph

Thanks for the clarification. This was found by an automated test rather than a concrete application need, so I don’t have a real-world case where the 3 vs 6 degree...

`Transformer.to_json()` returns `None` for valid CRS pair

``` from pyproj import Transformer t = Transformer.from_crs("EPSG:4326", "EPSG:27700") print(t.transform(-0.1278, 51.5074)) print(t.to_wkt()) # None