no need to synchronize read-only map access #257
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During intensive library usage (using
withPreloadedLanguageModels()) I found that CPU time is mostly spent on synchonization point in com.github.pemistahl.lingua.api.LanguageDetector.Companion#loadLanguageModels.I'm aware that the map is not thread-safe, but I believe it is not needed. The whole point of double-lock check pattern is to avoid unnecessary lock contention, and check without locking first. It is safe to lookup a
EnumMapconcurrently.