namespace containing only 'const enum' can be used as value -> causing runtime error

TypeScript Version: 3.2.0-dev.20181110

Search Terms: namespace const enum

Code

namespace foo {
    export const enum Foo {}
}
console.log(foo);

Expected behavior:
Error when using foo as a value. It's already an error to use a namespace that contains only types (and is therefore not emitted) as value.
The Symbol of the ModuleDeclaration actually contains constEnumOnlyModule: true, it just needs to be checked.

Actual behavior:

Doesn't emit the namespace in transpiled output, but it's still referenced by console.log(foo);

Playground Link: https://agentcooper.github.io/typescript-play/#code/HYQwtgpgzgDiDGEAEAzA9mpBvAUE-SEAHjGgE4AuS8awUVEwArmEgGIbYC+OPNdaADYQAdILQBzABTo0ASgDcQA

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