My understanding of the + operator is as follows. The + operator works differently with arrays than it does with scalar values. With arrays, when taking two arrays as operands, it returns an array containing everything in the two oeprand arrays. In essence, + operator performs addition on scalar types and union on arrays. For string, it does string concatenation. But what it does with blocks of html, such as what is returned by content_tag, I would like to know.
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