I can't see how your wtf-example shows any rounding to 2**53.

The following examples imply rounding to 53 bits: 
D:\>perl -le "print 'wtf' unless ~0 < (~0) + 2048;"
wtf

D:\>perl -le "print 'wtf' unless ~0 < (~0) + 2049;"

D:\>

[download]
Cheers,
Rob

In reply to Re^9: Largest integer in 64-bit perl (UPDATED) by syphilis
in thread Largest integer in 64-bit perl by harangzsolt33

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