c#:
the function Ipow() called in TestRandomNumbers() in Test Cases (but not in Test or Attempt) doesn't seem to be correct, it raises an OverflowException if b is rather big. Could Test Cases get updated?:

 private static int Ipow(int b, int e)
 {
     int p = 1;
     for (; e > 0; e >>= 1)
     {
         if ((e & 1) == 1) p *= b;
         b *= b;
     }
     return p;
 }

Lua:

Random tests always (as in 99% of the time) return non-square numbers

Why return c() for input integer(0) don't work in R?

c# translation

There is a mistake in random tests in ruby. In one point it's expected the code to pass with really big numbers, over 2 billions, at second poing it's expected to return nil for number over 1 billion becouse its to big number.

nitpick: a minor typo in the decsription check whet[H]er a given

A little disappointing that the tests are so undemanding. Even the very naive solutions can pass.

What is the maximum possible value for "n"?

Similar to this issue but in Python:

Assertions are placed in conditional blocks what causes that they are sometimes not executed, making test output incomplete.

Jintekki's TypeScript Translation

In python, you should forbid the ** and pow operator, because naive solutions, that similar to me, pass.

C#: TestUpTo500 can be passed with a solution which returns any incorrect answer, for example (0, 0).