Question on RefValue

It is even better than list defined by someone, you can use Julia functions to construct it!

According to View all functions exported in a package

julia> names(Base)
915-element Vector{Symbol}:
 :!
 :!=
 :!==
 ⋮

julia> names(Base, all = true)
5391-element Vector{Symbol}:
 :!
 :!=
 :!==
 ⋮

And for each exported symbol you can read documentation with the help of ?

julia> ? # you need to press question mark to switch to help mode
help?> !
search: ! != !== sum! put! pop! map! get! any! all! take! sort! read! push! prod! kron! fill! copy! conj! union! popat! merge! empty! count! clamp! unique! splice! resize! insert! filter!

  !(x)

  Boolean not. Implements three-valued logic (https://en.wikipedia.org/wiki/Three-valued_logic), returning missing if x is missing.
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