def qp
      qph = {}
      each { |k, v| qph[k.qp] = v.qp }
      qph.pp_s
    end
def qp
      qph = {}
      each { |k, v| qph[k.qp] = v.qp }
      qph.pp_s
    end
qp, short for quick-print, prints this Hasher with a filter that calls qp on each key and value.

 @return [String] the quick-print result