[Form] Add extra data attributes for collections#5145
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leevigraham wants to merge 1 commit intosymfony:masterfrom
leevigraham:feature/form-twig-prototype
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[Form] Add extra data attributes for collections#5145leevigraham wants to merge 1 commit intosymfony:masterfrom leevigraham:feature/form-twig-prototype
leevigraham wants to merge 1 commit intosymfony:masterfrom
leevigraham:feature/form-twig-prototype