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int?

core-api



    cfunction
    src/core/corelib.c on line 652, column 1

    (int? x)

    Check if x can be exactly represented as a 32 bit signed two's 
    complement integer.

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(map int?  [ nil   true  0    1    3.14   (math/trunc 3.14)  (band 1.1 2.2) ])
# =>      @[ false false true true false  true               true           ]

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