I am the function definition macro for debugging.

I mainly should be used on functions which satisfy:

1. Needing to be private i.e. not expose API to other Engines.
2. Important for core functionality and hence requiring documentation.

Given the two are satisfied, use me to define a function which becomes public once in debug mode and otherwise remains private.

I am to be used alongside the docp/1 macro to allow for good documentation practices.

I am a macro which allows to provide documentation to possibly private functions.

If the environment of the application is :debug I actually put the docs into the compiled module. If not, I produce nil, which does not interact with overall module environment.

@spec message_label(any()) :: {:ok, String.t()} | :continue

Helps labeling for Kino.Process.seq_trace/2, for the Router abstraction

@spec rock_opts(bool()) :: list()

If I receive true, I give a list with a rocksdb option.

Else I give an empty list.