fixes memory-leak: WeakHashMap -> SoftHashMap<…TickMark> - based cache #291
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fixed slow memory-leak by replacing WeakHashMap with SoftHashMap<…TickMark> - based cache implementation
See the following references for details:
https://ewirch.github.io/2013/12/weakhashmap-memory-leaks.html
https://franke.ms/memoryleak1.wiki
N.B. latter author filed this as a bug at http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7145759 which was apparently dropped by Oracle devs as supposedly the intended behaviour for a WeakHashMap-based cache.