Make sort_by_alphanum consistent for chunks that parse to the same int like 04 and 4.

lib/roqua/core_ext/enumerable/sort_by_alphanum.rb

@@ -26,7 +26,7 @@ module Enumerable
       a_chunk, a = extract_alpha_or_number_group(a)
       b_chunk, b = extract_alpha_or_number_group(b)
 
-      ret = if a_chunk =~ /\d/ and b_chunk =~ /\d/
+      ret = if a_chunk =~ /\d/ && b_chunk =~ /\d/ && a_chunk.to_i != b_chunk.to_i
               a_chunk.to_i <=> b_chunk.to_i
             else
               a_chunk <=> b_chunk

spec/roqua/core_ext/enumerable/sort_by_alphanum_spec.rb

@@ -14,5 +14,10 @@ describe Enumerable do
     it 'compares number chunks as integers' do
       expect(%w(004 3).sort_by_alphanum).to eq %w(3 004)
     end
+
+    it 'sorts identical integers by asci'  do
+      input = %w[b4e b0004e b04e b004e]
+      expect(input.sort_by_alphanum).to  eq %w[b0004e b004e b04e b4e]
+    end
   end
 end