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MAGIC *does not* support the update-proxy family of functions that let you change the method bodies of a proxy by providing it with a hashmap. we can't find an example of it ever being used in the wild, and implementing it would make it very hard to make proxy fast.
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if it becomes an issue, we can address it down the line. for now we generate a very tight type that is indistinguishable from a C# interop type. note that we're also fixing minor inconveniences along the way, like the need to cast to an int in the count method.


