BUG: .sel method gives error when label is float different from coords float type

generalizing to coerce not only scalar/lists float but also numpy arrays

Author: HasanAhmadQ7

xarray/core/indexing.py

@@ -249,7 +249,7 @@ def remap_label_indexers(data_obj, indexers, method=None, tolerance=None):
                                  'an associated coordinate.')
             pos_indexers[dim] = label
         else:
-            coords_dtype = data_obj.coords[dim].values.dtype
+            coords_dtype = data_obj.coords[dim].dtype
             label = maybe_cast_to_coords_dtype(label, coords_dtype)
             idxr, new_idx = convert_label_indexer(index, label,
                                                   dim, method, tolerance)

xarray/core/utils.py

@@ -67,9 +67,7 @@ def _maybe_cast_to_cftimeindex(index: pd.Index) -> pd.Index:
 
 
 def maybe_cast_to_coords_dtype(label, coords_dtype):
-    if isinstance(label, float):
-        label = coords_dtype.type(label)
-    elif isinstance(label, list) and coords_dtype.kind == 'f':
+    if coords_dtype.kind == 'f' and not isinstance(label, slice):
         label = np.asarray(label, dtype=coords_dtype)
     return label