array(2) {
  ["on-sale"]=>
  array(2) {
    ["type"]=>
    string(7) "on-sale"
    ["label"]=>
    string(8) "On sale!"
  }
  ["discount"]=>
  array(2) {
    ["type"]=>
    string(8) "discount"
    ["label"]=>
    string(4) "-35%"
  }
}

• Sales
• -35%

array(1) {
  ["discount"]=>
  array(2) {
    ["type"]=>
    string(8) "discount"
    ["label"]=>
    string(4) "-20%"
  }
}

• -20%

array(0) {
}

array(2) {
  ["on-sale"]=>
  array(2) {
    ["type"]=>
    string(7) "on-sale"
    ["label"]=>
    string(8) "On sale!"
  }
  ["discount"]=>
  array(2) {
    ["type"]=>
    string(8) "discount"
    ["label"]=>
    string(4) "-30%"
  }
}

• Sales
• -30%

array(2) {
  ["on-sale"]=>
  array(2) {
    ["type"]=>
    string(7) "on-sale"
    ["label"]=>
    string(8) "On sale!"
  }
  ["discount"]=>
  array(2) {
    ["type"]=>
    string(8) "discount"
    ["label"]=>
    string(4) "-35%"
  }
}

• Sales
• -35%

array(0) {
}

array(1) {
  ["discount"]=>
  array(2) {
    ["type"]=>
    string(8) "discount"
    ["label"]=>
    string(4) "-25%"
  }
}

• -25%

array(2) {
  ["on-sale"]=>
  array(2) {
    ["type"]=>
    string(7) "on-sale"
    ["label"]=>
    string(8) "On sale!"
  }
  ["discount"]=>
  array(2) {
    ["type"]=>
    string(8) "discount"
    ["label"]=>
    string(4) "-40%"
  }
}

• Sales
• -40%