--- /dev/null
+var metadata = require('./_metadata')
+ , anObject = require('./_an-object')
+ , toMetaKey = metadata.key
+ , getOrCreateMetadataMap = metadata.map
+ , store = metadata.store;
+
+metadata.exp({deleteMetadata: function deleteMetadata(metadataKey, target /*, targetKey */){
+ var targetKey = arguments.length < 3 ? undefined : toMetaKey(arguments[2])
+ , metadataMap = getOrCreateMetadataMap(anObject(target), targetKey, false);
+ if(metadataMap === undefined || !metadataMap['delete'](metadataKey))return false;
+ if(metadataMap.size)return true;
+ var targetMetadata = store.get(target);
+ targetMetadata['delete'](targetKey);
+ return !!targetMetadata.size || store['delete'](target);
+}});
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