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See https://api.drupal.org/api/drupal/core!includes!form.inc/function/form_p... and this comment on the docs here: https://api.drupal.org/comment/50708#comment-50708
Comments
Comment #1
LeeHunter CreditAttribution: LeeHunter commentedComment #2
jhodgdonNot documenting form API stuff in this project any more in D8.