Ensure that when an array with duplicate items passes through data-foreach we render all the items
Revert "Ensure that when an array with duplicate items passes through data-foreach we render all the items"

This reverts commit 170e2f548ae88486c79072a63eb43f481df97481.
Docs: Explain that duplicate items in an enumerable will only render once in a data-foreach
Merge pull request #660 from Shopify/data-foreach-duplicate-items

data-foreach should render all items in an array even if there are duplicates