 			line ?= source
 			@target = target
 			@line = line
+			@pending = false
 			@updateLoops = 0
 
 			if target is 'parent' or item._parent is target

			assert.lengthOf def, 1
			@anchors = []
			def = [def[0], '']

			baseAnchors = getBaseAnchorsPerAnchorType[def[0]]?[source]
			baseAnchors ?= getBaseAnchors[source]

				@type = 'sibling'

			for handler in getSourceWatchProps[source]
				item[handler] update, @

			@prop = getItemProp[source]
			@getSourceValue = getSourceValue[source]
