That's just a bug. Or it should be considered one. 

Perl> use Devel::Peek;;
Perl> $n = 9_999_999_998; print Dump( $n ); print $n & 1; print Dump( 
+$n );;

SV = NV(0x1844044) at 0x19920c4
  REFCNT = 1
  FLAGS = (NOK,pNOK)
  NV = 9999999998

1
SV = PVNV(0x1985a0c) at 0x19920c4
  REFCNT = 1
  FLAGS = (NOK,pIOK,pNOK,IsUV)
  UV = 4294967295
  NV = 9999999998
  PV = 0

[download]

The silent 'promotion' of the NV to an UV with data loss is very messy.

It's also kinda schizophrenic when you consider that perl does differentiate between integer and real operations some places. Take the arbitrary and intensely annoying case of: 

Perl> $c++ for 1 .. 2**32;;
[Range iterator outside integer range at (eval 7) line 1, <STDIN> line
+ 3.

[download]
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^3: &1 is no faster than %2 when checking for oddness. Oh well. (range) by BrowserUk
in thread &1 is no faster than %2 when checking for oddness. Oh well. by diotalevi

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