Issue 107 return types (#109)

* Add DSS to Docs

* Wrap all ES in the lazy_gufunc_wrapper

* explicitly cast array of shape () to the item type

* Revert "Wrap all ES in the lazy_gufunc_wrapper"

This reverts commit 89ff80a.

Author: simon-hirsch

scoringrules/core/utils.py

@@ -45,7 +45,10 @@ def lazy_gufunc_wrapper_uv(func):
     def wrapper(*args):
         out = np.empty_like(args[0])
         func(*args, out)
-        return out
+        if out.shape == ():
+            return out.item()
+        else:
+            return out
 
     return wrapper
 
@@ -62,6 +65,9 @@ def lazy_gufunc_wrapper_mv(func):
     def wrapper(*args):
         out = np.empty_like(args[0][..., 0])
         func(*args, out)
-        return out
+        if out.shape == ():
+            return out.item()
+        else:
+            return out
 
     return wrapper