Path measure cannot use the same code approach for quadratics
and cubics. Subdividing cubics repeatedly does not result in
subdivided t values, e.g. a quarter circle cubic divided in
half twice does not have a t value equivalent to 1/4.
Instead, always compute the cubic segment from a pair of
t values.
When finding the length of the cubic through recursive measures,
it is enough to carry the point at a given t to the next
subdivision.
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