Loosen up the Geos::Geometry#== operator on non-Geometry comparisons.

The #eql? method still behaves strictly and does type checking as
before, but the == operator has been loosened to allow for more
generalized comparisons, akin to comparing numeric values to Strings and
the like.

lib/ffi-geos/geometry.rb

@@ -332,9 +332,16 @@ def eql?(geom)
       check_geometry(geom)
       bool_result(FFIGeos.GEOSEquals_r(Geos.current_handle, self.ptr, geom.ptr))
     end
-    alias :== :eql?
     alias :equals? :eql?
 
+    def ==(geom)
+      if geom.is_a?(Geos::Geometry)
+        self.eql?(geom)
+      else
+        false
+      end
+    end
+
     def eql_exact?(geom, tolerance)
       check_geometry(geom)
       bool_result(FFIGeos.GEOSEqualsExact_r(Geos.current_handle, self.ptr, geom.ptr, tolerance))

test/geometry_tests.rb

@@ -1581,11 +1581,21 @@ def test_eql
     geom_a = read('POINT(1.0 1.0)')
     geom_b = read('POINT(2.0 2.0)')
 
-    %w{ eql? equals? == }.each do |method|
+    %w{ eql? equals? }.each do |method|
+      assert(geom_a.send(method, geom_a), "Expected geoms to be equal using #{method}")
       refute(geom_a.send(method, geom_b), "Expected geoms to not be equal using #{method}")
     end
   end
 
+  def test_equals_operator
+    geom_a = read('POINT(1.0 1.0)')
+    geom_b = read('POINT(2.0 2.0)')
+
+    assert(geom_a == geom_a, "Expected geoms to be equal using ==")
+    refute(geom_a == geom_b, "Expected geoms to not be equal using ==")
+    refute(geom_a == "test", "Expected geoms to not be equal using ==")
+  end
+
   def test_eql_exact
     geom_a = read('POINT(1.0 1.0)')
     geom_b = read('POINT(2.0 2.0)')