Python fork resolves this issue

username checks out ;-)

PHP: It should be specified in the description that, if the array has a NaN element, the function should return NaN.

You are absolutely right to mention this. Description updated:

Everyone except the twins are single-born (i.e., unique individuals).

rejected by someone

Because "Greeting" is case-sensitive

Please be more clear about what the tests are expecting.

Edit: Ah, I see it now. For anybody reading, the kata's description is misleading: you are not supposed to print a newline character (at least in Python and JS, maybe in other languages as well).

But still, misleading those trying to solve your kata (unless it's a puzzle) is a very bad practice.

Approved the fork of the fork.

An 8kyu should not deliberately confuse people or make them try to understand whatever happened in the author's brain when they submitted this weird description.

you are righ, same as in the original, probably ypou might want to report the issue

Missing random tests.

I don't see that test in the JS original. Maybe you know what I'm missing, I'm very new to translations.

(The NaN tests I omitted totally since there's no equivalent in Python.)

I think you missed this test case for floats:

Test.it 'should work for floats', ->
    Test.assertEquals(arr2bin([2.718281828459045,2,true]),"100.101101111110000101010001011000101000101011101101")

give me my 4 hours