Fix equality operation for Geometry subclasses

[absurdfarce]

Wondering if I got this wrong in my earlier change, trying to do some testing to confirm.

[hiSandog]

For the geometry equality fix, it would be useful to cover hashCode and cross-subclass comparisons in the same test area. Equality bugs often reappear when two subclasses share identical coordinates but should not compare equal as domain types. A null/empty geometry case would also help document the intended behavior.