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Both methods have been used successfully. You'll find some pro/con arguments on both sides, based on theories about thermal expansion of the floor and dome. There are some threads here discussing this.
In theory, the dome and the floor, made of the same material and similarly insulated, will heat up and cool down as a unit. In practice, the fitted-in floor always has a slight gap between the wall and the dome wall which fills up with fluffy wood ash. No problem either way.