module ActiveSupport::LoggerThreadSafeLevel

def local_level=(level)
  case level
  when Integer
  when Symbol
    level = Logger::Severity.const_get(level.to_s.upcase)
  when nil
  else
    raise ArgumentError, "Invalid log level: #{level.inspect}"
  end
  if level.nil?
    IsolatedExecutionState.delete(local_level_key)
  else
    IsolatedExecutionState[local_level_key] = level
  end
end