13 files changed, 13 insertions, 0 deletions
diff --git a/lib/json/add/bigdecimal.rb b/lib/json/add/bigdecimal.rb
index 0ef69f1..539daee 100644
--- a/lib/json/add/bigdecimal.rb
+++ b/lib/json/add/bigdecimal.rb
@@ -1,3 +1,4 @@
+#frozen_string_literal: false
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end
diff --git a/lib/json/add/complex.rb b/lib/json/add/complex.rb
index 3d653bb..28ef734 100644
--- a/lib/json/add/complex.rb
+++ b/lib/json/add/complex.rb
@@ -1,3 +1,4 @@
+#frozen_string_literal: false
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end
diff --git a/lib/json/add/core.rb b/lib/json/add/core.rb
index 77d9dc0..bfb017c 100644
--- a/lib/json/add/core.rb
+++ b/lib/json/add/core.rb
@@ -1,3 +1,4 @@
+#frozen_string_literal: false
 # This file requires the implementations of ruby core's custom objects for
 # serialisation/deserialisation.
 
diff --git a/lib/json/add/date.rb b/lib/json/add/date.rb
index 4288237..6a9f16e 100644
--- a/lib/json/add/date.rb
+++ b/lib/json/add/date.rb
@@ -1,3 +1,4 @@
+#frozen_string_literal: false
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end
diff --git a/lib/json/add/date_time.rb b/lib/json/add/date_time.rb
index 5ea42ea..0edeeda 100644
--- a/lib/json/add/date_time.rb
+++ b/lib/json/add/date_time.rb
@@ -1,3 +1,4 @@
+#frozen_string_literal: false
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end
diff --git a/lib/json/add/exception.rb b/lib/json/add/exception.rb
index e6ad257..d6ecfed 100644
--- a/lib/json/add/exception.rb
+++ b/lib/json/add/exception.rb
@@ -1,3 +1,4 @@
+#frozen_string_literal: false
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end
diff --git a/lib/json/add/ostruct.rb b/lib/json/add/ostruct.rb
index da81e10..b8bf8ed 100644
--- a/lib/json/add/ostruct.rb
+++ b/lib/json/add/ostruct.rb
@@ -1,3 +1,4 @@
+#frozen_string_literal: false
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end
diff --git a/lib/json/add/range.rb b/lib/json/add/range.rb
index e61e553..d9c97dd 100644
--- a/lib/json/add/range.rb
+++ b/lib/json/add/range.rb
@@ -1,3 +1,4 @@
+#frozen_string_literal: false
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end
diff --git a/lib/json/add/rational.rb b/lib/json/add/rational.rb
index ee39c20..356940b 100644
--- a/lib/json/add/rational.rb
+++ b/lib/json/add/rational.rb
@@ -1,3 +1,4 @@
+#frozen_string_literal: false
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end
diff --git a/lib/json/add/regexp.rb b/lib/json/add/regexp.rb
index 2fcbb6f..df945ba 100644
--- a/lib/json/add/regexp.rb
+++ b/lib/json/add/regexp.rb
@@ -1,3 +1,4 @@
+#frozen_string_literal: false
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end
diff --git a/lib/json/add/struct.rb b/lib/json/add/struct.rb
index 6847cde..2180207 100644
--- a/lib/json/add/struct.rb
+++ b/lib/json/add/struct.rb
@@ -1,3 +1,4 @@
+#frozen_string_literal: false
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end
diff --git a/lib/json/add/symbol.rb b/lib/json/add/symbol.rb
index 03dc9a5..1f07bf7 100644
--- a/lib/json/add/symbol.rb
+++ b/lib/json/add/symbol.rb
@@ -1,3 +1,4 @@
+#frozen_string_literal: false
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end
diff --git a/lib/json/add/time.rb b/lib/json/add/time.rb
index d983467..d0cb97d 100644
--- a/lib/json/add/time.rb
+++ b/lib/json/add/time.rb
@@ -1,3 +1,4 @@
+#frozen_string_literal: false
 unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
   require 'json'
 end