doctest failure in ~/work/ClassicalTestTheory.jl/ClassicalTestTheory.jl/src/reliability/ten_berge.jl:64-70 ```jldoctest julia> mu_up_to(2) 3-element Vector{Mu}: (::Mu) (generic function with 1 method) (::Mu) (generic function with 1 method) (::Mu) (generic function with 1 method) ``` Subexpression: mu_up_to(2) Evaluated output: ERROR: UndefVarError: mu_up_to not defined Stacktrace: [1] top-level scope @ none:1 Expected output: 3-element Vector{Mu}: (::Mu) (generic function with 1 method) (::Mu) (generic function with 1 method) (::Mu) (generic function with 1 method) diff = Warning: Diff output requires color. 3-element Vector{Mu}: (::Mu) (generic function with 1 method) (::Mu) (generic function with 1 method) (::Mu) (generic function with 1 method)ERROR: UndefVarError: mu_up_to not defined Stacktrace: [1] top-level scope @ none:1

Process completed with exit code 1.