
doc:   [
    DocGroup({"tag": "h1"}, [
        DocGroup({"tag": "caret", "client": "a"}, []),
        DocGroup({"client": "b", "tag": "caret"}, []),
        DocChars("8ello world!")
    ]),
    DocGroup({"tag": "p"}, [
        DocChars("What\'s up with you?")
    ])
]

a_del: [
    DelGroup([
        DelGroup([]),
        DelWithGroup([]),
        DelSkip(1), DelChars(1), DelSkip(8), DelChars(2)
    ]),
    DelWithGroup([])
]
a_add: [
    AddGroup({"tag": "h2"}, [
        AddWithGroup([]),
        AddSkip(1), AddChars("SS")
    ]),
    AddGroup({"tag": "bullet"}, [
        AddGroup({"tag": "p"}, [
            AddChars("W"), AddSkip(8), AddGroup({"tag": "caret", "client": "a"}, []),
            AddChars("c")
        ])
    ]),
    AddWithGroup([
        AddChars(" ")
    ])
]

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