Why isn't `size` always inferred to be an Integer?

General Usage
,
11

This is not type-piracy. The type Bad is defined inside the actual “module” and you define Base.size on it.

IIUC type piracy is that you define an external function to your module to a type external to it. Something like this

module A
function f() end
end

module B
struct MyType end
end

module C
import ..A: f
import ..B: MyType

function f(x::MyType) end # type piracy
end
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