Version 5.3.15

@snakefoot

Improvements

#773: UseNLog allow fallback to only EnvironmentName for NLog config (#773) (@snakefoot)
#771: NLogMessageParameterList - Optimize the index operator (#771) (@snakefoot)
#770: NLogMessageParameterList - Simplify the index operator (#770) (@snakefoot)
#768: Recognize ITuple for better AOT support (#768) (@snakefoot)

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