Usage of local keyword in global scope

Currently local keyword is allowed in global scope. You can write things like:

local x = 1

or

local f() = 1

However, bindings to x nor f are not introduced in global scope and defining f effectively is equivalent to defining an anonymous function.

My question is is this intentional and has some use or usage of local should be disallowed in global scope? I could not find any discussion of this here nor on GitHub.

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