[Bug-gsl] [bug #40092] false position root finding requires too many function evals

[Max]

Follow-up Comment #3, bug #40092 (project gsl):

I would like to stress the point from the original message.

The minimal step for root finding should not be much less
than the specified precision. The current design separates
the step and the test stages so the information
on the precision is not available when the new root
approximation is calculated. The result is more iteration
that for an efficient implementation of the same method.

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