Support nested putCloseable invocations (issues/404) #405
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Signed-off-by: Matthew Pearson <matthewpearson@gmail.com>
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Hi folks,
This PR fixes #404 by preventing
putCloseablefrom clobbering a key that was present in the MDC before theputCloseablewas created. It thereby allows nestedputCloseables. The existing behavior surprised us when we were writing some recursive code. Let me know what you think, and thanks for making SLF4j!