I did read your article and did look at the other PR, but to be perfectly honest it looked a bit low-effort; the justification is simply "It just makes more sense that way", and the change looks very minor. (Which, of course I don't blame the PR author because they're not obligated to do anything, but at the same time I can't blame the maintainers as much for not merging it.)
Your PR, on the other hand, looks great! The changes look well-reasoned and well-documented, though I don't know Calculator so I can't judge the code.
But, don't be discouraged, neither by the lack of response so far, nor the criticism here. Hopefully they'll merge your PR, if not, I hope you'll find some other open source project you can contribute to, or you can start your own :)
(I should've also said the positive part in my first comment, not just the negative part, apologies.)