[Jprogramming] _. ! _.

[bill lam]

While I ran the test suite, I found that,

on linux debian jessie (gcc,amd64)
   _. ! _.
_.

on jqt/android 2.3.3 and 4.0 (ndk,armv6)
   _. ! _.
_.

on iPhone 3GS iOS 5 (clang,armv6?)
   _. ! _.
|NaN error
|   _.    !_.


Which should be correct?  Or it can depend on C compiler?

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