Set stacklevel on warning for proper issue pinpointing.

without the stacklevel the warning point to the frame where the warnign
is issued. In this case we likely want to be at least two callers up as
we want to see the caller of `create` or `open_array`.

Author: Carreau

zarr/creation.py

@@ -149,12 +149,18 @@ def _kwargs_compat(compressor, fill_value, kwargs):
 
     if compressor != 'default':
         # 'compressor' overrides 'compression'
-        if 'compression' in kwargs:
-            warn("'compression' keyword argument overridden by 'compressor'")
-            del kwargs['compression']
-        if 'compression_opts' in kwargs:
-            warn("'compression_opts' keyword argument overridden by 'compressor'")
-            del kwargs['compression_opts']
+        if "compression" in kwargs:
+            warn(
+                "'compression' keyword argument overridden by 'compressor'",
+                stacklevel=3,
+            )
+            del kwargs["compression"]
+        if "compression_opts" in kwargs:
+            warn(
+                "'compression_opts' keyword argument overridden by 'compressor'",
+                stacklevel=3,
+            )
+            del kwargs["compression_opts"]
 
     elif 'compression' in kwargs:
         compression = kwargs.pop('compression')