1_strings.rb

with extlib loaded

irb(main):011:0> a = { :x => "test" }
=> {:x=>"test"}
irb(main):012:0> b = { :x => "    " }
=> {:x=>"    "}
irb(main):013:0> p a.deep_merge!(b)
{:x=>"test"}
=> nil

without extlib

irb(main):006:0> a = { :x => "test" }
=> {:x=>"test"}
irb(main):007:0> b = { :x => "    " }
=> {:x=>"    "}
irb(main):008:0> p a.deep_merge!(b)
{:x=>"    "}
=> nil

2_booleans.rb

with extlib loaded and patch from http://gist.github.com/274453

irb(main):006:0> a = { :x => true }
=> {:x=>true}
irb(main):007:0> b = { :x => false }
=> {:x=>false}
irb(main):008:0> p a.deep_merge!(b)
{:x=>true}
=> nil

without extlib loaded and patch from http://gist.github.com/274453

irb(main):003:0> a = { :x => true }
=> {:x=>true}
irb(main):004:0> b = { :x => false }
=> {:x=>false}
irb(main):005:0> p a.deep_merge!(b)
{:x=>false}
=> nil