crash on NSArray.uniq.map

apologize for bug in previous my pull request.

NSArray.uniq returns NSArray, but it's concrete class is some private class.
And the class does not responds -initWithObjects:count:.

I don't know that.
We can't determine object's class mutability?

```testProxyArrayMap``` says:

```
/tmp/YOLOtests.m:576: error: -[GeneralTests testProxyArrayMap] : failed: caught "NSInvalidArgumentException", "*** -[NSArray initWithObjects:count:]: method only defined for abstract class.  Define -[__NSOrderedSetArrayProxy initWithObjects:count:]!"
(
0   CoreFoundation                      0x00007fff92e0d64c __exceptionPreprocess + 172
1   libobjc.A.dylib                     0x00007fff852966de objc_exception_throw + 43
2   CoreFoundation                      0x00007fff92e1129f __CFRequireConcreteImplementation + 271
3   CoreFoundation                      0x00007fff92dfa8e7 -[NSArray initWithObjects:count:] + 39
4   YOLOtests                           0x0000000104527952 __20-[NSArray(YOLO) map]_block_invoke + 1186
5   YOLOtests                           0x00000001045151cb -[GeneralTests testProxyArrayMap] + 315
6   CoreFoundation                      0x00007fff92ce633c __invoking___ + 140
7   CoreFoundation                      0x00007fff92ce6192 -[NSInvocation invoke] + 290
8   XCTest                              0x0000000104566919 -[XCTestCase invokeTest] + 253
9   XCTest                              0x0000000104566b1a -[XCTestCase performTest:] + 150
10  XCTest                              0x000000010456f700 -[XCTest run] + 257
11  XCTest                              0x000000010456582b -[XCTestSuite performTest:] + 379
12  XCTest                              0x000000010456f700 -[XCTest run] + 257
13  XCTest                              0x000000010456582b -[XCTestSuite performTest:] + 379
14  XCTest                              0x000000010456f700 -[XCTest run] + 257
15  XCTest                              0x000000010457272f __24+[XCTestProbe runTests:]_block_invoke189 + 44
16  XCTest                              0x000000010456e36d -[XCTestObservationCenter _observeTestExecutionForBlock:] + 162
17  XCTest                              0x0000000104572655 +[XCTestProbe runTests:] + 347
18  libobjc.A.dylib                     0x00007fff8528fc49 _class_initialize + 649
19  libobjc.A.dylib                     0x00007fff8529e99e lookUpImpOrForward + 179
20  libobjc.A.dylib                     0x00007fff8528a1ac objc_msgSend + 236
21  libobjc.A.dylib                     0x00007fff85290567 call_load_methods + 747
22  libobjc.A.dylib                     0x00007fff8528f60d load_images + 78
23  ???                                 0x00007fff68690f86 0x0 + 140734945103750
24  ???                                 0x00007fff6869e85e 0x0 + 140734945159262
25  ???                                 0x00007fff6869e806 0x0 + 140734945159174
26  ???                                 0x00007fff6869e6f8 0x0 + 140734945158904
27  ???                                 0x00007fff6869e969 0x0 + 140734945159529
28  ???                                 0x00007fff68691245 0x0 + 140734945104453
29  ???                                 0x00007fff68694be1 0x0 + 140734945119201
30  ???                                 0x00007fff68690276 0x0 + 140734945100406
31  ???                                 0x00007fff68690036 0x0 + 140734945099830
)
  FAIL testProxyArrayMap (7.327s)
```