Change two recently added classes to strict typing

New code may as well go all in on type hints. I'll be interested to see
if this helps with maintainability over time.

lib/pdf/reader/point.rb

@@ -1,5 +1,5 @@
 # coding: utf-8
-# typed: true
+# typed: strict
 # frozen_string_literal: true
 
 module PDF

lib/pdf/reader/rectangle.rb

@@ -1,5 +1,5 @@
 # coding: utf-8
-# typed: true
+# typed: strict
 # frozen_string_literal: true
 
 module PDF
@@ -85,7 +85,7 @@ def apply_rotation(degrees)
           new_x2 = bottom_left.x
           new_y2 = bottom_left.y + width
         end
-        set_corners(new_x1, new_y1, new_x2, new_y2)
+        set_corners(new_x1 || 0, new_y1 || 0, new_x2 || 0, new_y2 || 0)
       end
 
       private

rbi/pdf-reader.rbi

@@ -1110,7 +1110,10 @@ module PDF
           y: Numeric,
         ).void
       end
-      def initialize(x, y); end
+      def initialize(x, y)
+        @x = T.let(0, Numeric)
+        @y = T.let(0, Numeric)
+      end
 
       sig { returns(Numeric) }
       def x; end
@@ -1138,6 +1141,7 @@ module PDF
     end
 
     class Rectangle
+
       sig { params(arr: T::Array[Numeric]).returns(PDF::Reader::Rectangle) }
       def self.from_array(arr); end
 
@@ -1149,7 +1153,13 @@ module PDF
           y2: Numeric
         ).void
       end
-      def initialize(x1, y1, x2, y2); end
+
+      def initialize(x1, y1, x2, y2)
+        @bottom_left = T.let(PDF::Reader::Point.new(0,0), PDF::Reader::Point)
+        @bottom_right = T.let(PDF::Reader::Point.new(0,0), PDF::Reader::Point)
+        @top_left = T.let(PDF::Reader::Point.new(0,0), PDF::Reader::Point)
+        @top_right = T.let(PDF::Reader::Point.new(0,0), PDF::Reader::Point)
+      end
 
       sig { returns(PDF::Reader::Point) }
       def bottom_left; end
@@ -1174,6 +1184,15 @@ module PDF
 
       sig { params(degrees: Integer).void }
       def apply_rotation(degrees); end
+
+      sig { params(point: PDF::Reader::Point).void }
+      def contains?(point); end
+
+      sig { params(other: PDF::Reader::Rectangle).void }
+      def ==(other); end
+
+      sig { params(x1: Numeric, y1: Numeric, x2: Numeric, y2: Numeric).void }
+      def set_corners(x1, y1, x2, y2); end
     end
 
     class Reference