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The article actually agrees.

> In mathematics, the term linear function refers to two distinct but related notions (...) [proceeds to specify them using incomprehensible math words]

GNU Units documentation uses the second notion, common with linear algebra (and thus arguably more common in any computing) - the notion that calls y=ax a linear function, and y=ax+b an affine function.

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So, rather than calling it non-linear, which is clearly somewhat confusing, perhaps it would be more clear to state that it handles affine functions like F to C...?

Perhaps. That's what I myself did when adding handling for affine unit conversions in a project I worked on.

Agreed. Why they wasting our time pointing out it’s “non-linear” when this statement is only true for some definitions of linear? Just pick a non-ambiguous word, or add an asterisk and footnote.

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