Check layer value types

framer/Layer.coffee

@@ -21,6 +21,9 @@ layerProperty = (obj, name, cssProperty, fallback, validator, set) ->
 
 		set: (value) ->
 
+			if value and validator and not validator(value)
+				throw new Error("Layer.#{name}: value '#{value}' of type '#{typeof(value)}'' is not valid")
+
 			@_properties[name] = value
 			@_element.style[cssProperty] = LayerStyle[cssProperty](@)
 

test/tests/LayerTest.coffee

@@ -233,6 +233,13 @@ describe "Layer", ->
 			layer.backgroundColor.should.equal "red"
 			layer.style["backgroundColor"].should.equal "red"
 
+		it "should check value type", ->
+
+			f = ->
+				layer = new Layer
+				layer.x = "hello"
+			f.should.throw()
+
 
 	describe "Filter Properties", ->