ExpressionFunctionValueSource lazily evaluates in doubleValues: an
expression like

   condition ? f1 : f2

will only evaluate one of f1 or f2.

At the same time, the advanceExact() call is greedy -- when you
advance that expression it will also advance both f1 and f2. But
here's the thing: it always returns true, regardless of whether f1 and
f2 advance. Which makes sense from the point of view of the lazy
evaluation -- if condition is true we don't care whether f2 advances
or not.

My question is whether we could defer these child advanceExact calls
until ExpressionFunctionValues.doubleValue()?

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