assertion on path not containing meta should be meta/

this avoids disallowing key names such as 'metabolite', for instance

Author: grlee77

zarr/hierarchy.py

@@ -600,7 +600,7 @@ def _array_iter(self, keys_only, method, recurse):
         if self._version == 2:
             for key in sorted(listdir(self._store, self._path)):
                 path = self._key_prefix + key
-                assert not path.startswith("meta")
+                assert not path.startswith("meta/")
                 if contains_array(self._store, path):
                     _key = key.rstrip("/")
                     yield _key if keys_only else (_key, self[key])
@@ -615,7 +615,7 @@ def _array_iter(self, keys_only, method, recurse):
                 if key.endswith(array_sfx):
                     key = key[:-len(array_sfx)]
                 path = self._key_prefix + key
-                assert not path.startswith("meta")
+                assert not path.startswith("meta/")
                 if key.endswith('.group' + self._metadata_key_suffix):
                     # skip group metadata keys
                     continue