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HZ: avoid convergence if bisected #174

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HZ: avoid convergence if bisected #174

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Commits on Jan 28, 2024

  1. HZ: avoid convergence if bisected 

    secant2 calls update, and update might switch to bisection in the U3 step. If we did bisect, the line-search progress
step L2 testing whether the interval is shrinking fast
enough is nonsensical (we might have shrunk multiple
iterations of bisection, but that is not an indication that the
secant model was "working").

Consequently, this reports back about whether bisection
was engaged in `update`, and if so skip any kind of
convergence assessment and do another iteration.

Fixes JuliaNLSolvers#173.
    @timholy
    timholy committed Jan 28, 2024
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