Use `unboundable?` rather than `boundable?`

The `unboundable?` behaves like the `infinite?`.

```ruby
inf = Topic.predicate_builder.build_bind_attribute(:id, Float::INFINITY)
inf.infinite?    # => 1

oob = Topic.predicate_builder.build_bind_attribute(:id, 9999999999999999999999999999999)
oob.unboundable? # => 1

inf = Topic.predicate_builder.build_bind_attribute(:id, -Float::INFINITY)
inf.infinite?    # => -1

oob = Topic.predicate_builder.build_bind_attribute(:id, -9999999999999999999999999999999)
oob.unboundable? # => -1
```

activerecord/lib/active_record/relation/query_attribute.rb

@@ -20,18 +20,23 @@ def with_cast_value(value)
       def nil?
         !value_before_type_cast.is_a?(StatementCache::Substitute) &&
           (value_before_type_cast.nil? || value_for_database.nil?)
+      rescue ::RangeError
       end
 
-      def boundable?
-        return @_boundable if defined?(@_boundable)
-        nil?
-        @_boundable = true
+      def infinite?
+        infinity?(value_before_type_cast) || infinity?(value_for_database)
       rescue ::RangeError
-        @_boundable = false
       end
 
-      def infinite?
-        infinity?(value_before_type_cast) || boundable? && infinity?(value_for_database)
+      def unboundable?
+        if defined?(@_unboundable)
+          @_unboundable
+        else
+          value_for_database
+          @_unboundable = nil
+        end
+      rescue ::RangeError
+        @_unboundable = type.cast(value_before_type_cast) <=> 0
       end
 
       private

activerecord/lib/active_record/validations/uniqueness.rb

@@ -58,7 +58,7 @@ def find_finder_class_for(record)
       def build_relation(klass, attribute, value)
         relation = klass.unscoped
         comparison = relation.bind_attribute(attribute, value) do |attr, bind|
-          return relation.none! unless bind.boundable?
+          return relation.none! if bind.unboundable?
 
           if bind.nil?
             attr.eq(bind)

activerecord/lib/arel/nodes/bind_param.rb

@@ -28,8 +28,8 @@ def infinite?
         value.respond_to?(:infinite?) && value.infinite?
       end
 
-      def boundable?
-        !value.respond_to?(:boundable?) || value.boundable?
+      def unboundable?
+        value.respond_to?(:unboundable?) && value.unboundable?
       end
     end
   end

activerecord/lib/arel/visitors/to_sql.rb

@@ -576,7 +576,7 @@ def visit_Arel_Table(o, collector)
 
         def visit_Arel_Nodes_In(o, collector)
           if Array === o.right && !o.right.empty?
-            o.right.keep_if { |value| boundable?(value) }
+            o.right.delete_if { |value| unboundable?(value) }
           end
 
           if Array === o.right && o.right.empty?
@@ -590,7 +590,7 @@ def visit_Arel_Nodes_In(o, collector)
 
         def visit_Arel_Nodes_NotIn(o, collector)
           if Array === o.right && !o.right.empty?
-            o.right.keep_if { |value| boundable?(value) }
+            o.right.delete_if { |value| unboundable?(value) }
           end
 
           if Array === o.right && o.right.empty?
@@ -812,8 +812,8 @@ def inject_join(list, collector, join_str)
           }
         end
 
-        def boundable?(value)
-          !value.respond_to?(:boundable?) || value.boundable?
+        def unboundable?(value)
+          value.respond_to?(:unboundable?) && value.unboundable?
         end
 
         def has_join_sources?(o)