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$oh->add( 'a', 5 );           # like $oh{a} += 5
$oh->concat( 'a', 'hello' );  # like $oh{a} .= 'hello'

>>> h = {'a' : 1}
>>> h['a'] += 2
...
>>> oh['b'] += ' world'
>>> oh
OrderedDict([('a', 5), ('b', 'hello world')])