sqrt error with low confidence

[primalr]

I get Math::DomainError: Numerical argument is out of domain - "sqrt"
when running:
WilsonScore.rating_lower_bound(1, 100, 1..5, confidence: 0.12)
or
WilsonScore.rating_lower_bound(5, 25, 1..5, confidence: 0.8)

but not when running:
WilsonScore.rating_lower_bound(2, 100, 1..5, confidence: 0.12)

[cmantas]

I can confirm, even with less extreme values

pry(main)> WilsonScore.rating_lower_bound(2.0, 10, (0..2), confidence: 0.8)
Math::DomainError: Numerical argument is out of domain - "sqrt"

however the problem does not appear with correction turned off:

WilsonScore.rating_lower_bound(2.0, 10, (0..2), confidence: 0.8, correction: false)
=> 1.7178626381200672