code: func (t Types) GetBySuffix(suffix string) (tp Type, found bool) {
  	for _, tt := range t {
  		if match := tt.matchSuffix(suffix); match != "" {
  			if found {
  				// ambiguous
  				found = false
  				return
  			}
  			tp = tt
  			tp.fileSuffix = match
  			found = true
  		}
  	}
  	return
  }
docs: // GetBySuffix gets a media type given as suffix, e.g. "html".
  // It will return false if no format could be found, or if the suffix given
  // is ambiguous.
  // The lookup is case insensitive.