Version numbers are completely arbitrary.
It's not about what you expect or think.
It's about what the dev actually uses.
I just pointed out how the developer uses it.
Developer for well over two and a half decades now, I'm quite well aware of software and hardware version schemes (edit: and hardware is even more Wild West). Your "pointing out" was incomplete and that is what I was bringing up. I'll spell it out for you in even simpler terms:
27 is the number of major versions released not a percentage number to the completion of the game, you can already consider it equivalent to a 0.9 versioning and close to completion.
No one said anything about percentage. "you can already consider it equivalent to a 0.9 versioning and close to completion." Where does that "0.9" comparison come from? Where is this rule coming from that it is an equivalent to a 0.9? Why do you assume 0.9 is close to completion? There are infinite numbers between 0.9 and 1.0. Are you assuming each release ("Major") is incremented always by 0.1? If so, state the developer's position on it (edit: when first responding about it, not just down the line after the lack of this in your response gets pointed out), don't just say it without referencing or providing some logical reason for it. Arbitrary assumption is just sloppy thinking. Common/universal facts (such as the Earth being spheroid) aren't always held to regard but anything data can be, which is why I was asking. You just huffed and fussed.
0. is just that the game is not technically complete and 1.0 is expected to be released in the future.
That's what the Dev is using, I just explained what he is using.
There is no real standard when it comes to version numbers, it's up to the developer's whim.
That does not explain the increment rule, the rule regarding increment between 0.0 and 1.0 which is what we were talking about (my pointing out that version numbering common to software is based on SemVer or SemVer-like which was intended to point out 0.X would be Minor unless otherwise stated by a developer since it is de facto because it's so common). You also claimed there is no real standard, so I brought up SemVer being a very real and very common standard, as a possibility to explain a common incrementing rule to query what you didn't explain. Blather on if you want, not wasting any more time on trying to point out what you did or didn't do.
For anyone else: 0.0.0.1 increments we can see in the changelog -currently appear- to be bug fixes or changes/tweaks to existing content, rather than anything considered new. 0.0.1 increments appeared previously to be a mixture of release, bug, changes/tweaks. See v0.9.X and back for example.