Differences in Distributions.quantile output between package v0.18 and v0.25.52

General Usage
1

I have a Julia 1.1 application I’m upgrading to 1.7
Here is some code:

using Distributions
g = Distributions.Gamma(0.004190129634501312, 0.00043125955824484334)
q = 0.0444788802702531
Distributions.quantile(g, q)

Under 1.1, Distribution package v0.18, the output is 0.0
Under 1.7, Distribution package v0.25.52 the output is:

DomainError with -1.606e-320:
log will only return a complex result if called with a complex argument. Try log(Complex(x)).

Stacktrace:
  [1] throw_complex_domainerror(f::Symbol, x::Float64)
    @ Base.Math .\math.jl:33
  [2] _log(x::Float64, base::Val{:ℯ}, func::Symbol)
    @ Base.Math .\special\log.jl:304
  [3] log
    @ .\special\log.jl:269 [inlined]
  [4] __gamma_inc_inv(a::Float64, minpq::Float64, pcase::Bool)
    @ SpecialFunctions C:\Program Files\ReSolver.DistributedJulia\depot\packages\SpecialFunctions\CQMHW\src\gamma_inc.jl:1048
  [5] _gamma_inc_inv
    @ C:\Program Files\ReSolver.DistributedJulia\depot\packages\SpecialFunctions\CQMHW\src\gamma_inc.jl:1012 [inlined]
  [6] gamma_inc_inv
    @ C:\Program Files\ReSolver.DistributedJulia\depot\packages\SpecialFunctions\CQMHW\src\gamma_inc.jl:994 [inlined]
  [7] gammainvcdf
    @ C:\Program Files\ReSolver.DistributedJulia\depot\packages\StatsFuns\dTYga\src\distrs\gamma.jl:98 [inlined]
  [8] quantile(d::Gamma{Float64}, q::Float64)
    @ Distributions C:\Program Files\ReSolver.DistributedJulia\depot\packages\Distributions\DiPwc\src\univariates.jl:627

My question is:

  • Is there a way of doing this without getting the error and getting 0.0 instead to maintain consistency?
  • Obviously I’m dealing with small numbers here - should I just try/catch the DomainError and return 0?

Thanks