
doc:   [
    DocGroup({"tag": "h1"}, [
        DocChars("haJo world"), DocGroup({"client": "a", "tag": "caret"}, [])
    ]),
    DocGroup({"tag": "h1"}, [
        DocChars("36Y"), DocGroup({"tag": "caret", "client": "b"}, []),
        DocChars("at\'s up with you?")
    ])
]

a_del: [
    DelGroup([
        DelSkip(6), DelChars(1), DelSkip(2), DelChars(1), DelGroup([])
    ]),
    DelGroup([
        DelSkip(21)
    ])
]
a_add: [
    AddGroup({"tag": "h2"}, [
        AddChars("C 5D"), AddSkip(6)
    ]),
    AddGroup({"tag": "bullet"}, [
        AddGroup({"tag": "p"}, [
            AddChars("8"), AddGroup({"client": "a", "tag": "caret"}, []),
            AddChars("Dl"), AddSkip(23)
        ])
    ])
]

b_del: [
    DelGroup([
        DelSkip(9), DelChars(1), DelWithGroup([])
    ]),
    DelGroup([
        DelChars(3), DelGroup([]),
        DelChars(2), DelSkip(15)
    ])
]
b_add: [
    AddGroup({"tag": "bullet"}, [
        AddGroup({"tag": "h1"}, [
            AddSkip(9), AddWithGroup([]),
            AddChars("   "), AddGroup({"tag": "caret", "client": "b"}, []),
            AddSkip(15)
        ])
    ])
]
