I see a lot of interesting questions, broadly in the category of contest math and recreational math, about the base $b$ expansion of an integer, often $b = 10$. For example: the sum of the digits, when this expansion has repeated digits, how many $0$s at the end, and so on.
I would like a tag to use for these questions other than just elementary-number-theory. Although these questions fall into a clear common category, I have found tagging them to be an awkward task -- no existing tag seems to fit the bill for a question about the sum of the base $b$ digits of an integer, for example.
In the answer to this old question it is suggested to use number-systems. However the tag wiki seems to have changed since then, to make it even more broad and less about integers than it already was. The tag wiki discusses not just base $b$ representation of integers, but also roman numerals, floating point numbers, factorial base, Fibonacci base, and so on.
Other related tags include
binary, helpful and appropriate for base $2$ but not for other bases;
decimal-expansion, possibly helpful for base $10$, but more appropriate for real number representation, and certainly not helpful for other bases;
None of these tags are about base $b$ representation for a general $b$, which is a very common and important topic in elementary number theory. It also strikes me as odd that we have decimal expansion and binary tags, but no tags for base $b$, of which these tags are just special cases. Therefore, I am suggesting we have a new tag for base $b$ representation of numbers. As a rough suggestion:
number-bases: Questions about the base $b$ representation of an integer, where $b$ is an integer, including: arithmetic in base $b$, converting between bases, the number of digits, the sum of digits, and other features of such representations. Often appropriate with elementary-number-theory, but may also be used for base $b$ representation of rational or real numbers. For questions about base $2$ or base $10$ in particular, consider using binary or decimal-expansion. For questions about some other representation, use number-systems.
Does the community agree this would be a useful tag, or have any suggestions for improving the scope and the above tag excerpt?