Our geometries are mutable, so they can be modified without
creating garbage by changing coordinates in place and calling
setGeometry afterwards. But this also means that we need to
create a deep clone of the coordinates.
Previously, the tests were using eql to make assertions about matching geometries. This is inappropriate for structures with circular references (as with goog.events.EventTarget);
In the typical sequence of parse-transform-render the most efficient place to transform coordinate values is deep within the parser immediately after values have been read (this would avoid a second pass over whatever structure is used to back geometries). To accomplish this transform during parsing, we could add back parser read options to pass the transform function around.
Until then, a transform method on geometries is straightforward to implement. This means we do a second pass through coordinate structures to transform, but this is typically done only once immediately after parsing.
