option.tolerance should always be defined in _hitTest()

src/item/Item.js

@@ -1489,7 +1489,7 @@ var Item = Base.extend(Callback, /** @lends Item# */{
 		// this item does not have children, since we'd have to travel up the
 		// chain already to determine the rough bounds.
 		if (!this._children && !this.getRoughBounds()
-				.expand(options.tolerance)._containsPoint(point))
+				.expand(2 * options.tolerance)._containsPoint(point))
 			return null;
 		// Transform point to local coordinates but use untransformed point
 		// for bounds check above.

src/item/Shape.js

@@ -277,8 +277,7 @@ new function() { // Scope for _contains() and _hitTest() code.
 			if (this.hasStroke()) {
 				var shape = this._shape,
 					radius = this._radius,
-					strokeWidth = this.getStrokeWidth()
-							+ 2 * (options.tolerance || 0);
+					strokeWidth = this.getStrokeWidth() + 2 * options.tolerance;
 				switch (shape) {
 				case 'rectangle':
 					var center = getCornerCenter(this, point, strokeWidth);

src/path/Path.js

@@ -1731,7 +1731,7 @@ var Path = PathItem.extend(/** @lends Path# */{
 		var style = this.getStyle(),
 			segments = this._segments,
 			closed = this._closed,
-			tolerance = options.tolerance || 0,
+			tolerance = options.tolerance,
 			radius = 0, join, cap, miterLimit,
 			that = this,
 			area, loc, res;