• (ms) InternalDebug now replaces all instances of INTERNAL_DEBUG,
  not just the first one.
  
• (ms) Added test case for get_logger() with a ref() on the actual
  object instead of on a static category. Updated docs.
  
• (ms) %d{e} in PatternLayout now returns epoch seconds
  
• (ms) [RT 72056] Messages blocked by an appender threshold are no
  longer passed on to the L4p::Appender::Buffer as undefined
  entries.