From a computer science perspective it is formally 'meaningless' because the performance improvement was made by changing the requirements, not by a novel algorithm or data structure. This is always possible, but it ignores the original constraints of the problem and hence doesn't shed any additional meaning on how to solve the original problem.

From a programmer perspective, that might not change the fact that it's useful. It has 'meaning' to the programmer in that it helps us solve a particular problem. Typically, app programmers are not as concerned with how the problem was solved.

I like the library, but to avoid this kind of criticism, don't call it a reimplementation. Call it what it is, an alternative library of functions.