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> It is not clear to me that it would be any faster, since it involves branches
> that would never be taken if the data contained no user-defined entities.
You're probably a better coder than I am, but if I have "&f;" expanding
to "foobar", and I want to implement in-place conversion, then I always
have to have a "lookaside" place, and my read-from-the-source routine
always has to look to see if the pushback is non-empty, etc.