Backport fix for broken Proj.__call__ with single input array

Author: molinav

CHANGELOG.md

@@ -22,6 +22,8 @@ https://semver.org/spec/v2.0.0.html
 - Fix flipped coastlines with pseudocylindrical projections when `lon_0`
   is greater than 0 deg (solves issues [#443] and [#463], thanks to
   @YilongWang).
+- Fix broken `Proj.__call__` when the input arguments are provided as
+  a combined single array.
 - Fix `antialiased` argument being ignored in `Basemap.drawcounties` and
   `Basemap.readshapefile` (solves issue [#501], thanks to @TheFizzWare).
 - Fix wrong reference to `ireland.py` example in FAQ, which should be

packages/basemap/src/mpl_toolkits/basemap/proj.py

@@ -290,7 +290,8 @@ def __call__(self, *args, **kw):
                 return x,y
         inverse = kw.get('inverse', False)
         if onearray:
-            outxy = self._proj4(xy, inverse=inverse)
+            outx, outy = self._proj4(*xy.T, inverse=inverse)
+            outxy = np.asarray([outx, outy]).T
         else:
             outx,outy = self._proj4(x, y, inverse=inverse)
         if inverse: