Re: [w3c/FileAPI] Async createObjectURL (#84)

@annevk Module Map in HTML / ECMA262 is Idempotent. If you `import` a  Data URL like the one above, it lives for the life of the Realm of JS. In the example above it is a simple `{}` that gets allocated and can never be GC'd. Unlike `URL.createObjectURL` there is no way to revoke an entry from the Module Map. A user could allocate more complex things or even just make variable storage that can never be GC'd in a similar way that is matched up to a string.

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