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When I pass an HTML string into an hint it will escape the tags, even if the string is already flagged as html_safe.
<%= f.input :content, :label => false, :hint => "hey".html_safe %>
Introduced in commit 364ae5c
Fixed in commit d2d8131016d56080794
More intelligent way to html_escape labels and hints (GH-299)
This commit won't escape html entities in strings marked as html_safe according to newer rails versions.
Additionally you can now turn html escaping off by setting
Formtastic::SemanticFormBuilder.escape_html_entities_in_hints_and_labels = false