[Bug][DataCollector] Fix the regression caused by the removal of double-stringification#10361

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francoispluchino wants to merge 2 commits intosymfony:masterfrom

francoispluchino:fix-stringification-collector

Commits on Mar 2, 2014

Fix the regression caused by the removal of double-stringification
François Pluchino
committed

Commits on Mar 3, 2014

Adds tests of regression for the removal of double-stringification
francoispluchino
committed