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printf "-1:%2d %30f:%d +1:%2d\n", 
    (frexp( $_ - 1 ))[1], $_, (frexp( $_ ))[1], (frexp( $_ +1 ))[1] 
...
-1:63     4611686018427387900.000000:63 +1:63
-1:64     9223372036854775800.000000:64 +1:64
-1:65    18446744073709552000.000000:65 +1:65