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> Isn't that what documentation is for?

I would agree, if everything was documented. The issue at-hand is what is not explicitly documented. What constitutes a guard-worthy function? ie A pure javadoc without any notation about what the API does, is not sufficient.

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> The issue at-hand is what is not explicitly documented. What constitutes a guard-worthy function?

https://hexdocs.pm/elixir/1.15/patterns-and-guards.html#guar...

Plus the docs lists on the sidebar which custom functions are guards. Examples: https://hexdocs.pm/elixir/1.15/Integer.html#guards

The question was about why not what is allowed as a guard. Perhaps this was not clear amongst the noise.

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