Can I get a rough guesstimate from the JVM guys how much more overhead is involved in accessing a never-changed MutableCallSite versus a ConstantCallSite? I have a few places where I want to use invokedynamic to lazily initialize some literals. They'll never change after the initial construction, but I can't create them in the bootstrap because I need the state they pass in (e.g. the org.jruby.Ruby instance they're associated with). I'd like to bind a constant method handle into the site after the first call and never change it again.
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