Comparison operators treat null/true/false as 0/1/0.

lib/capuchin/kernel.rb

@@ -133,6 +133,12 @@ def initialize(name=nil, object={}, mod=nil, &block)
     end
   end
 end
+module JSComparable
+  def js_lt(other); self.js_cmp < other.js_cmp; end
+  def js_gt(other); self.js_cmp > other.js_cmp; end
+  def js_lte(other); self.js_cmp <= other.js_cmp; end
+  def js_gte(other); self.js_cmp >= other.js_cmp; end
+end
 class Class
   def js_new(*args); new(*args); end
   def js_instance_of(v); self === v; end
@@ -188,25 +194,23 @@ def self.js_new(*args)
     new(*args)
   end
 end
-class Integer
-  def js_div(n); n == 0 ? self.to_f / n : self / n; end
+class Numeric
+  include JSComparable
+  def js_cmp; self; end
+  def js_typeof; 'number'; end
   js_def :valueOf do
     self
   end
 end
 class Fixnum
+  def js_div(n); (0 == n ? self.to_f : self) / n; end
   def js_key; self; end
   def js_truthy?; 0 != self; end
-  def js_typeof; 'number'; end
 end
 class Float
-  def js_typeof; 'number'; end
   js_def :toFixed do |x|
     self.to_i
   end
-  js_def :valueOf do
-    self
-  end
   js_def :toPrecision do |digits|
     "%.#{digits}f" % self
   end
@@ -215,6 +219,7 @@ class Symbol
   def js_key; self; end
 end
 class String
+  def js_cmp; to_f; end
   js_attr :length do
     size
   end
@@ -227,11 +232,20 @@ def js_truthy?; size > 0; end
   def js_typeof; 'string'; end
 end
 class TrueClass
+  include JSComparable
+  def js_cmp; 1; end
   def js_typeof; 'boolean'; end
 end
 class FalseClass
+  include JSComparable
+  def js_cmp; 0; end
   def js_typeof; 'boolean'; end
 end
+class NilClass
+  include JSComparable
+  def js_cmp; 0; end
+  def js_div(n); 0.js_div(n); end
+end
 class Method
   include JSOpen
   def js_prototype

lib/capuchin/visitor.rb

@@ -483,8 +483,8 @@ def visit_PostfixNode(o)
   [
     [ :Add,       :js_add,  :OpPlusEqual,   :meta_send_op_plus  ],
     [ :Subtract,  :-,       :OpMinusEqual,  :meta_send_op_minus ],
-    [ :Greater,   :>,       nil,            :meta_send_op_gt    ],
-    [ :Less,      :<,       nil,            :meta_send_op_lt    ],
+    [ :Greater,   :js_gt,   nil,            :meta_send_op_gt    ],
+    [ :Less,      :js_lt,   nil,            :meta_send_op_lt    ],
   ].each do |name,op,eq,meta|
     define_method(:"visit_#{name}Node") do |o|
       pos(o)
@@ -513,8 +513,8 @@ def visit_PostfixNode(o)
     [ :Multiply,            :*,       :OpMultiplyEqual ],
     [ :RightShift,          :>>,      :OpRShiftEqual   ],
     [ :UnsignedRightShift,  :">>>",   :OpURShiftEqual  ],
-    [ :GreaterOrEqual,      :>=,      nil              ],
-    [ :LessOrEqual,         :<=,      nil              ],
+    [ :GreaterOrEqual,      :js_gte,  nil              ],
+    [ :LessOrEqual,         :js_lte,  nil              ],
   ].each do |name,op,eq|
     define_method(:"visit_#{name}Node") do |o|
       pos(o)