
doc:   [
    DocGroup({"tag": "bullet"}, [
        DocGroup({"tag": "h2"}, [
            DocChars("  "), DocGroup({"tag": "caret", "client": "b"}, [])
        ]),
        DocGroup({"tag": "p"}, []),
        DocGroup({"tag": "p"}, [
            DocChars("052X0b3")
        ]),
        DocGroup({"tag": "pre"}, [
            DocChars("2T4   "), DocGroup({"tag": "caret", "client": "a"}, []),
            DocChars("o  up with you?")
        ])
    ])
]

a_del: [
    DelGroup([
        DelWithGroup([
            DelSkip(2), DelWithGroup([])
        ]),
        DelWithGroup([]),
        DelWithGroup([
            DelSkip(7)
        ]),
        DelWithGroup([
            DelChars(6), DelGroup([])
        ])
    ])
]
a_add: [
    AddWithGroup([
        AddSkip(2), AddWithGroup([])
    ]),
    AddWithGroup([]),
    AddWithGroup([
        AddSkip(7), AddGroup({"tag": "caret", "client": "a"}, [])
    ]),
    AddWithGroup([
        AddChars("P")
    ])
]

b_del: [
    DelWithGroup([
        DelGroup([
            DelChars(2), DelGroup([])
        ]),
        DelGroup([]),
        DelWithGroup([])
    ])
]
b_add: [
    AddWithGroup([
        AddGroup({"tag": "h2"}, [
            AddChars("0")
        ]),
        AddWithGroup([
            AddChars("B"), AddGroup({"client": "b", "tag": "caret"}, [])
        ])
    ])
]
