Feature form_fields with arrays

It looks like if I currently try to submit an array in a form, form_fields() handles it by returning multiple key-value pairs, where the keys start with the array name (including the brackets, escaped for HTML...) and successive items just append continuous underscores to this.

Would it be possible to instead return just one pair, key name without the brackets, and have the value be a comma or semicolon or anything-delineated list of the submitted values?
 
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