Change hardcoded defaults

Author: jsignell

xarray/core/parallel.py

@@ -352,8 +352,8 @@ def _wrapper(
 
         merged_coordinates = merge(
             [arg.coords for arg in args if isinstance(arg, Dataset | DataArray)],
-            join="outer",
-            compat="no_conflicts",
+            join="exact",
+            compat="override",
         ).coords
 
         # check all dims are present
@@ -442,7 +442,9 @@ def _wrapper(
     xarray_objs = tuple(arg.chunk(arg.chunksizes) for arg in xarray_objs)
 
     merged_coordinates = merge(
-        [arg.coords for arg in aligned], join="outer", compat="no_conflicts"
+        [arg.coords for arg in aligned],
+        join="exact",
+        compat="override",
     ).coords
 
     _, npargs = unzip(
@@ -478,7 +480,7 @@ def _wrapper(
         coordinates = merge(
             (preserved_coords, template.coords.to_dataset()[new_coord_vars]),
             join="outer",
-            compat="no_conflicts",
+            compat="override",
         ).coords
         output_chunks: Mapping[Hashable, tuple[int, ...]] = {
             dim: input_chunks[dim] for dim in template.dims if dim in input_chunks

xarray/plot/dataarray_plot.py

@@ -199,10 +199,9 @@ def _prepare_plot1d_data(
                     darray = concat(
                         [darray, darray_nan],
                         dim=dim,
-                        data_vars="all",
-                        coords="different",
-                        compat="equals",
-                        join="outer",
+                        coords="minimal",
+                        compat="override",
+                        join="exact",
                     )
                     dims_T.append(coords_to_plot[v])