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Better code style (use Kotlin stdlib rather than Java's where possible).
Avoid unnecessary allocations.
Removed warming.
On my machine, with Oracle's JDK 8, I observed an improvement when running the warming program from 1.3 seconds to 1.2 seconds.
This is extremely fast, much faster than Go for example, even including the JVM startup time!
Even the Java optimised implementation I submitted on #173, running with the GraalVM JIT, is not as fast!