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A comment on IT Runs on Java 8. Parent comment
Oh, the JIT devirtualizes and inlines even if there are many implementations, but only one or two at a particular callsite. This has been generalized in Graal/Truffle so you almost automatically get stuff like this (https://twitter.com/ChrisGSeaton/status/619885182104043520, https://gist.github.com/chrisseaton/4464807d93b972813e49) by doing little more than writing an interpreter.
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Oh, the JIT devirtualizes and inlines even if there are many implementations, but only one or two at a particular callsite. This has been generalized in Graal/Truffle so you almost automatically get stuff like this (https://twitter.com/ChrisGSeaton/status/619885182104043520, https://gist.github.com/chrisseaton/4464807d93b972813e49) by doing little more than writing an interpreter.