lib/google/cloud/spanner/instance/config/list.rb in google-cloud-spanner-1.6.0 vs lib/google/cloud/spanner/instance/config/list.rb in google-cloud-spanner-1.6.1

@@ -147,10 +147,10 @@
             def self.from_grpc grpc, service, max = nil
               configs = List.new(Array(grpc.instance_configs).map do |config|
                 Instance::Config.from_grpc config
               end)
               token = grpc.next_page_token
-              token = nil if token == ""
+              token = nil if token == "".freeze
               configs.instance_variable_set :@token,   token
               configs.instance_variable_set :@service, service
               configs.instance_variable_set :@max,     max
               configs
             end