Don't use canonicalize option to trigger writing VERSION, just use the absence of a version option. Otherwise, canonicalize will modify literals and IRIs to their canonical form.

Author: gkellogg

lib/rdf/ntriples/writer.rb

@@ -217,7 +217,7 @@ def initialize(output = $stdout, validate: true, **options, &block)
     # @return [self]
     # @abstract
     def write_prologue
-      puts %(VERSION #{version.inspect}) if version && !canonicalize?
+      puts %(VERSION #{version.inspect}) if version
       @logged_errors_at_prolog = log_statistics[:error].to_i
       super
     end

spec/nquads_spec.rb

@@ -322,9 +322,9 @@
       end.to write(%(VERSION "1.2"))
     end
 
-    it "does not write version with :version and :canonicalize options" do
+    it " not write version with unless specified" do
       expect do
-        described_class.new($stdout, version: "1.2", canonicalize: true) do |w|
+        described_class.new($stdout, version: nil) do |w|
           w.insert(graph)
         end
       end.not_to write(%(VERSION "1.2"))

spec/ntriples_spec.rb

@@ -931,9 +931,9 @@
       end.to write(%(VERSION "1.2"))
     end
 
-    it "does not write version with :version and :canonicalize options" do
+    it "does not write version with unless specified" do
       expect do
-        writer.new($stdout, version: "1.2", canonicalize: true) do |w|
+        writer.new($stdout, version: nil) do |w|
           w.insert(graph)
         end
       end.not_to write(%(VERSION "1.2"))