psql wishlist: value completion

Wouldn't it be cool if someday psql could do value completion?

  # delete from person where lastname = 'Garam<tab>
  # delete from person where lastname = 'Garamond' _

  # delete from person where firstname = 'Da<tab><tab>
  # delete from person where firstname = 'Da
  Damian  Darren  Dave    David    Dawson

  # delete from person where firstname = 'D<tab><tab>
  Display all 215 possibilities? (y or n)

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dave