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As I grow older, implementation details are all that matters to me in the end. I hate go language, IMO it's ugly and terrible to work with. But its compiler and toolset are golden and I'll use it just because of its implementation details. I don't have time to wait until language developers will implement implementation details I need, if ever. I need to ship software tomorrow.

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The compiler and toolset are the user facing aspects of a language like go, how the parser works or internal functions in the standard library would be the implementation details.

Hmmm. Implementation details are the stuff that are not visible to you as a “user” of the language and the toolset.

I don’t know why people confuse this so much

I would say that implementation details could be visible to you as a user, but should not be relied upon because they are not part of the documented API.

E.g. it might be visible to you that a certain operation runs quickly on certain inputs, or that a particular output is chosen for a particular input, even though the documentation does not specify the exact output.

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