Fix concurrency issue in SafeLazy #740
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By storing the thunk and the result as final fields of a contained class, we ensure that they will will always be in sync with each other when used, without actually locking anything.
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There's been some reports of concurrency issue around SafeLazy, so I am porting @mspnf's SafeLazy fix to open source, implemented prior to #731.
By storing the thunk and the result as final fields of a contained class, we ensure that they will will always be in sync with each other when used, without actually locking anything.