Brute force property removal when removeData([a,b,c]). Fixes #12786

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

src/data.js

@@ -136,6 +136,14 @@ function internalRemoveData( elem, name, pvt /* For internal use only */ ){
 						name = name.split(" ");
 					}
 				}
+			} else {
+				// If "name" is an array of keys...
+				// When data is initially created, via ("key", "val") signature,
+				// keys will be converted to camelCase.
+				// Since there is no way to tell _how_ a key was added, remove
+				// both plain key and camelCase key. #12786
+				// This will only penalize the array argument path.
+				name = name.concat( jQuery.map( name, jQuery.camelCase ) );
 			}
 
 			for ( i = 0, l = name.length; i < l; i++ ) {