[5.x] Allow Values object and Group fieldtype to be iterated #11182
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This replaces #10958.
This fixes an issue where you could not use the
foreachtag to loop over agroupfieldtype.The underlying issue is that when you have a
Valueinstance that evaluates to aValuesinstance (which is what thegroupfieldtype does), it wasn't properly iterable.getIteratorexpects aTraversableto be returned.In the included test, the last dataset (value with values) is the one that would fail, and is fixed by this PR.