How to implement promotion for functions like `collect` and `map`?

[nsajko]

@Deduction42

Is there a way to call “map” with specifying the output type so that we can manually set a union instead of an abstract container?

map(f, c) is roughly equivalent to collect(Iterators.map(f, c)). collect also allows specifying the element type explicitly:

collect(T, Iterators.map(f, c))

There’s also my package, Collects.jl:

• New package: Collects.jl - meant to improve upon and generalize the interface of collect