Sean Harvey 0cbde73445 API CHANGE #5873 DataObjectSet::shift() now performs a proper shift instead of unshift (wrong). Please use DataObjectSet::unshift($item) if unshifting was intended!
API CHANGE Added DataObjectSet::pop()
MINOR Unit tests for DataObjectSet::shift(), DataObjectSet::unshift() and DataObjectSet::pop()


git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/branches/2.4@109156 467b73ca-7a2a-4603-9d3b-597d59a354a9
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