on up/down arrow, set the input only if data.val is a string #184
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Enter search text, then click a down arrow; it sets the value of the input:
https://github.com/corejavascript/typeahead.js/blob/master/src/typeahead/typeahead.js#L416
but if the dataset contains objects, this will set the input to
[object Object]
:Arrows should only navigate through suggestions; clicking an arrow should not redo the search for just the highlighted suggestion. This change skips setting the input value if data is not a string.