This question has arisen after reading this answer to a question prohibiting a built-in which solves the problem. The poster argues that the built-in is not defined as "repeat a single integer a number of times equal to that integer" so it doesn't count as a built-in. However, it was brought up in the comments that it SHOULD NOT be valid because the single command solves the challenge regardless of how it is defined.
A simpler situation was also suggested in the comments. Suppose a challenge requested Boolean AND be performed without using a built-in AND operation. It was noted that both Minimum and multiplication have identical output to AND when restricted to the same input values (1-bit numbers).
Should built-ins designed for one task, which incidentally perform some other task as well, be considered a built-in for both tasks?