Iterating of the map should not throw a ConcurrentModificationException #78
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Create a copy of the entries (guarded by a readLock) and iterate over that copy.
This fixes #10 and maybe #30 (needs further testing though, couldn't reproduce that)
Create a copy of the underlying map and iterate over that, never throwing a ConcurrentModificationException. This comes with a small performance penalty though (copying the map content to new instance) but fixing the exception should have priority as this violates the contract of this class (threadsafe)