This function expands singleton nodes into bifurcating nodes with one zero-length branch. This isn't much and was originally used to convert phylo4 objects with singletons into phylo objects ('ape'). This adds new taxa and assigns them a unique identifiier name.
A tree with singleton nodes
Should a phyl4d (TRUE) or phylo4 (FALSE) object be returned.
This function isn't used much, but might be used to convert phylo4 objects with singletons to phylo objects with zero-length branches. Might be helpful for writing singletons to file (via ape).
A phylo4 object with the singletons converted.
J. Conrad Stack
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