Tree "tmp2.tre" is treated as rooted, due to the "[&R]" token, while
tree "tmp3.tre" is treated us unrooted due to lack of this token.
Coercing both trees to be treated as rooted (``rooting="force-rooted"``)
or unrooted (``rooted="force-unrooted"``) gives the same results for
Rooting state matters.
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