code: function mimeMatch (expected, actual) {
    // invalid type
    if (expected === false) {
      return false
    }
  
    // split types
    var actualParts = actual.split('/')
    var expectedParts = expected.split('/')
  
    // invalid format
    if (actualParts.length !== 2 || expectedParts.length !== 2) {
      return false
    }
  
    // validate type
    if (expectedParts[0] !== '*' && expectedParts[0] !== actualParts[0]) {
      return false
    }
  
    // validate suffix wildcard
    if (expectedParts[1].substr(0, 2) === '*+') {
      return expectedParts[1].length <= actualParts[1].length + 1 &&
        expectedParts[1].substr(1) === actualParts[1].substr(1 - expectedParts[1].length)
    }
  
    // validate subtype
    if (expectedParts[1] !== '*' && expectedParts[1] !== actualParts[1]) {
      return false
    }
  
    return true
  }
docs: Check if `expected` mime type
  matches `actual` mime type with
  wildcard and +suffix support.
  
  @param {String} expected
  @param {String} actual
  @return {Boolean}
  @private