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Asking for one more digit of output seems to take forever and leaks memory #50

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@dominikh

Running mpsolve -Ga -o 13 -p "3.2842919874852823e-295*x^3 + 6.734565977709723e+185*x^2 - 1.6583144507216154e-264*x + 7.925965171636945e+112" finishes in 20 milliseconds, reporting

(0.e-61, -0.343060940430431e-36)
(0.e-61, 0.343060940430431e-36)
(0.138514786474494e309, 0.114589091973173e309)

Increasing the number of digits from 13 to 14 doesn't finish for 30 minutes and eventually gets the process killed by the out-of-memory killer. mpsolve used 23 GB when that happened.

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