make Data::Perl::Stream::Array immutable

diff --git a/lib/Data/Perl/Stream/Array.pm b/lib/Data/Perl/Stream/Array.pm
index f9fcea2..7c0cd09 100644 (file)
--- a/lib/Data/Perl/Stream/Array.pm
+++ b/lib/Data/Perl/Stream/Array.pm
@@ -15,4 +15,6 @@ method next {
   return shift @$ary;
 }
 
+__PACKAGE__->meta->make_immutable;
+
 1;