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Lazy fields
It would be nice to have an optional WithLazyFields(key string, func() interface{})
method to calculate field value only when it's retrieved with Get(key string)
method.
I.e. some entries may be discarded due to log level, but they are still evaluated.
A real life example is dumping http requests/responses on debug level. It requires much more memory for each request to process, and it's painful to have some debug switches to turn it on/off on local/production system.