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Outputs a label and a text field, along with a datalist tag
datalist tag provides a list of options which drives a simple autocomplete
on the text field. This is a HTML5 feature, more info can be found at
{ <datalist> at MDN}
This input accepts a :collection option which takes data in all the usual formats accepted by
{ options_for_select}

@example Input is used as follows
  f.input :fav_book, :as => :datalist, :collection => Book.pluck(:name)
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