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Improve ibeta power term calculation in the Sterling case #1025

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merged 5 commits into from
Aug 31, 2023
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jzmaddock
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Completes #1007.

Yuhta and others added 5 commits August 5, 2023 12:53
If `guess` passed to `inverse_discrete_quantile` cannot be represented
as floating point number, it is possible that `guess + 1` or `guess - 1`
does not change the value at all and we are stuck in infinite loop
inside `round_to_floor` or `round_to_ceil`.  Fix this by
increase/decrease more than 1 in these cases.

Example code to reproduce this:
```c++
boost::math::binomial_distribution<> dist(9079765771874083840, 0.561815);
boost::math::quantile(dist, 0.0365346);
```
…the non Lanczos case).

Completes work started here: #1007
Fixes Conflicts:
	test/test_binomial.cpp
@jzmaddock
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One failure is a network/clone issue, merging...

@jzmaddock jzmaddock merged commit ce18ea4 into develop Aug 31, 2023
@NAThompson NAThompson deleted the pr1007 branch January 24, 2024 21:33
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