In article <b913ba1b0902130743j17a62d1ck9e8150912bfc8002 / mail.gmail.com>,
  James Coglan <jcoglan / googlemail.com> writes:

> Regardless of whether they're *supposed* to, the Rubies I've used before
> 1.8.7 actually do iterate in insertion order. Could be machine/OS specific,
> a fluke, whatever. The point is that 1.8.7 definitely does not iterate in
> the order that keys appear in a literal, at least on my machine. If this is
> supposed to now be defined behaviour I'll investigate further and file a bug
> if necessary.

Would you show us an example which the insertion order is
preserved on 1.8.6 and not preserved on 1.8.7?

I tested as follows.  The order is changed since 1.9.
1.8.7 is same as 1.8.6 and older.

% all-ruby -e 'h = {2=>"b", 1=>"a"}; p h'
ruby-1.4.6(2000-08-16)         {1=>"a", 2=>"b"}
ruby-1.6.0(2000-09-19)         {1=>"a", 2=>"b"}
ruby-1.6.1(2000-09-27)         {1=>"a", 2=>"b"}
ruby-1.6.2(2000-12-25)         {1=>"a", 2=>"b"}
ruby-1.6.3(2001-03-19)         {1=>"a", 2=>"b"}
ruby-1.6.4(2001-06-04)         {1=>"a", 2=>"b"}
ruby-1.6.5(2001-09-19)         {1=>"a", 2=>"b"}
ruby-1.6.6(2001-12-26)         {1=>"a", 2=>"b"}
ruby-1.6.7(2002-03-01)         {1=>"a", 2=>"b"}
ruby-1.6.8(2002-12-24)         {1=>"a", 2=>"b"}
ruby-1.8.0(2003-08-04)         {1=>"a", 2=>"b"}
ruby-1.8.1(2003-12-25)         {1=>"a", 2=>"b"}
ruby-1.8.2(2004-12-25)         {1=>"a", 2=>"b"}
ruby-1.8.3(2005-09-21)         {1=>"a", 2=>"b"}
ruby-1.8.4(2005-12-24)         {1=>"a", 2=>"b"}
ruby-1.8.5(2006-08-25)         {1=>"a", 2=>"b"}
ruby-1.8.5p52(2007-06-07)      {1=>"a", 2=>"b"}
ruby-1.8.5p113(2007-09-23)     {1=>"a", 2=>"b"}
ruby-1.8.5p115(2008-03-03)     {1=>"a", 2=>"b"}
ruby-1.8.5p231(2008-06-20)     {1=>"a", 2=>"b"}
ruby-1.8.5head(2008-06-20p231) {1=>"a", 2=>"b"}
ruby-1.8.6p0(2007-03-13)       {1=>"a", 2=>"b"}
ruby-1.8.6p36(2007-06-07)      {1=>"a", 2=>"b"}
ruby-1.8.6p110(2007-09-23)     {1=>"a", 2=>"b"}
ruby-1.8.6p111(2007-09-24)     {1=>"a", 2=>"b"}
ruby-1.8.6p114(2008-03-03)     {1=>"a", 2=>"b"}
ruby-1.8.6p230(2008-06-20)     {1=>"a", 2=>"b"}
ruby-1.8.6p287(2008-08-11)     {1=>"a", 2=>"b"}
ruby-1.8.6head(2009-02-13p330) {1=>"a", 2=>"b"}
ruby-1.8.7p0(2008-05-31)       {1=>"a", 2=>"b"}
ruby-1.8.7p17(2008-06-09)      {1=>"a", 2=>"b"}
ruby-1.8.7p22(2008-06-20)      {1=>"a", 2=>"b"}
ruby-1.8.7p72(2008-08-11)      {1=>"a", 2=>"b"}
ruby-1.8.7head(2009-02-13p116) {1=>"a", 2=>"b"}
ruby-1.8(2009-02-05r22080)     {1=>"a", 2=>"b"}
ruby-1.9.1p0(2009-01-30r21907) {2=>"b", 1=>"a"}
ruby-1.9(2009-02-11r22240)     {2=>"b", 1=>"a"}
-- 
Tanaka Akira