Kaba struct Tag ed

struct Tag
    var key: string
    var value: string

    # constructors
    func mut __init__()
    func mut __init__(key: string, value: string)

    # functions
    func match(filter: Tag) -> bool
    func strh() -> string

    # operators
    func __str__() -> string             # str(Tag) -> string
    func __lt__(o: Tag) -> bool          # Tag < Tag -> bool
    func mut __assign__(other: Tag)      # Tag = Tag