diff --git a/CHANGELOG.md b/CHANGELOG.md
index 434b387f0..334eb60c3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,11 @@
 
     *Garett Arrowood*
 
+*   Add ability to turn off sanitization of custom scope arguments.
+    PR [#742](https://github.com/activerecord-hackery/ransack/pull/742).
+
+    *Garett Arrowood*
+
 ### Fixed
 
 *   Use class attributes properly so that inheritance is respected.
diff --git a/README.md b/README.md
index 7aa51c370..bc2013b28 100644
--- a/README.md
+++ b/README.md
@@ -661,7 +661,21 @@ Employee.ransack({ salary_gt: 100_000 }, { auth_object: current_user })
 In Rails 3 and 4, if the `true` value is being passed via url params or some
 other mechanism that will convert it to a string, the true value may not be
 passed to the ransackable scope unless you wrap it in an array
-(i.e. `activated: ['true']`). This is currently resolved in Rails 5 :smiley:
+(i.e. `activated: ['true']`). Ransack will take care of changing 'true' into a
+boolean. This is currently resolved in Rails 5 :smiley:
+
+However, perhaps you have `user_id: [1]` and you do not want Ransack to convert
+1 into a boolean. (Values sanitized to booleans can be found in the
+[constants.rb](https://github.com/activerecord-hackery/ransack/blob/master/lib/ransack/constants.rb#L28)).
+To turn this off, and handle type conversions yourself, set
+`sanitize_custom_scope_booleans` to false in an initializer file like
+config/initializers/ransack.rb:
+
+```ruby
+Ransack.configure do |c|
+  c.sanitize_custom_scope_booleans = false
+end
+```
 
 Scopes are a recent addition to Ransack and currently have a few caveats:
 First, a scope involving child associations needs to be defined in the parent
diff --git a/lib/ransack/configuration.rb b/lib/ransack/configuration.rb
index a1c21133a..d5064be41 100644
--- a/lib/ransack/configuration.rb
+++ b/lib/ransack/configuration.rb
@@ -11,7 +11,8 @@ module Configuration
       :ignore_unknown_conditions => true,
       :hide_sort_order_indicators => false,
       :up_arrow => '▼'.freeze,
-      :down_arrow => '▲'.freeze
+      :down_arrow => '▲'.freeze,
+      :sanitize_scope_args => true
     }
 
     def configure
@@ -98,6 +99,22 @@ def custom_arrows=(opts = {})
       self.options[:down_arrow] = opts[:down_arrow].freeze if opts[:down_arrow]
     end
 
+    # Ransack sanitizes many values in your custom scopes into booleans.
+    # [1, '1', 't', 'T', 'true', 'TRUE'] all evaluate to true.
+    # [0, '0', 'f', 'F', 'false', 'FALSE'] all evaluate to false.
+    #
+    # This default may be globally overridden in an initializer file like
+    # `config/initializers/ransack.rb` as follows:
+    #
+    # Ransack.configure do |config|
+    #   # Accept my custom scope values as what they are.
+    #   config.sanitize_custom_scope_booleans = false
+    # end
+    #
+    def sanitize_custom_scope_booleans=(boolean)
+      self.options[:sanitize_scope_args] = boolean
+    end
+
     # By default, Ransack displays sort order indicator arrows in sort links.
     # The default may be globally overridden in an initializer file like
     # `config/initializers/ransack.rb` as follows:
diff --git a/lib/ransack/search.rb b/lib/ransack/search.rb
index e73cdebcf..419687ca4 100644
--- a/lib/ransack/search.rb
+++ b/lib/ransack/search.rb
@@ -123,12 +123,18 @@ def inspect
     private
 
     def add_scope(key, args)
+      sanitized_args = if Ransack.options[:sanitize_scope_args]
+        sanitized_scope_args(args)
+      else
+        args
+      end
+
       if @context.scope_arity(key) == 1
         @scope_args[key] = args.is_a?(Array) ? args[0] : args
       else
-        @scope_args[key] = args.is_a?(Array) ? sanitized_scope_args(args) : args
+        @scope_args[key] = args.is_a?(Array) ? sanitized_args : args
       end
-      @context.chain_scope(key, sanitized_scope_args(args))
+      @context.chain_scope(key, sanitized_args)
     end
 
     def sanitized_scope_args(args)
diff --git a/spec/ransack/adapters/active_record/base_spec.rb b/spec/ransack/adapters/active_record/base_spec.rb
index dc6b72ea1..31ca60415 100644
--- a/spec/ransack/adapters/active_record/base_spec.rb
+++ b/spec/ransack/adapters/active_record/base_spec.rb
@@ -65,25 +65,31 @@ module ActiveRecord
               expect(s.result.to_sql).to (include 'age > 18')
             end
 
-            # TODO: Implement a way to pass true/false values like 0 or 1 to
-            # scopes (e.g. with `in` / `not_in` predicates), without Ransack
-            # converting them to true/false boolean values instead.
-
-            # it 'passes true values to scopes', focus: true  do
-            #   s = Person.ransack('over_age' => 1)
-            #   expect(s.result.to_sql).to (include 'age > 1')
-            # end
-
-            # it 'passes false values to scopes', focus: true  do
-            #   s = Person.ransack('over_age' => 0)
-            #   expect(s.result.to_sql).to (include 'age > 0')
-            # end
-
             it 'chains scopes' do
               s = Person.ransack('over_age' => 18, 'active' => true)
               expect(s.result.to_sql).to (include 'age > 18')
               expect(s.result.to_sql).to (include 'active = 1')
             end
+
+            context "with sanitize_custom_scope_booleans set to false" do
+              before(:all) do
+                Ransack.configure { |c| c.sanitize_custom_scope_booleans = false }
+              end
+
+              after(:all) do
+                Ransack.configure { |c| c.sanitize_custom_scope_booleans = true }
+              end
+
+              it 'passes true values to scopes' do
+                s = Person.ransack('over_age' => 1)
+                expect(s.result.to_sql).to (include 'age > 1')
+              end
+
+              it 'passes false values to scopes'  do
+                s = Person.ransack('over_age' => 0)
+                expect(s.result.to_sql).to (include 'age > 0')
+              end
+            end
           end
 
           it 'does not raise exception for string :params argument' do