Hack on the Enum struct to allow for `Color.parse("Red | Green")`

enum_parse_with_or.cr

struct Enum
  def self.parse?(string : String) : self?
    parts = string.split("|")
    output = new(0)
    parts.each do |part|
      p = previous_def(part.strip)
      return nil if p.nil?
      output |= p
    end
    output
  end
end

Also, for YAML compatibility, you can:

struct Enum
  def new(i : Int64)
    new i.to_i32
  end
end