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As the Ruby logger does, logging methods should be able to receive a block with the message, that allows to delay the evaluation of complex messages until the message is actually logged.
Also by doing this, this gem will be out of the box compatible with Rails, in the sense that it will work with the Rack middleware responsable of logging every request https://github.com/rails/rails/blob/ee35b79d4cff24b960be54c3f5c4f46627c069fe/railties/lib/rails/rack/logger.rb#L37