Seems no, not related to bitwise ops. Actually yes, this example shows that addition is not affected. 

use Devel::Peek;
use strict;
no warnings "numeric";
sub xx {
    my $arg=shift;
    Dump( $arg );
    print "ARG+1=".($arg+1)."\n";
}
xx("ff");
xx(7);
xx("ff");
__END__

SV = PV(0x729b78) at 0x754ae0
  REFCNT = 1
  FLAGS = (PADMY,POK,pPOK)
  PV = 0x747d90 "ff"\0
  CUR = 2
  LEN = 8
ARG+1=1
SV = PVNV(0x72b5f0) at 0x754ae0
  REFCNT = 1
  FLAGS = (PADMY,IOK,pIOK)
  IV = 7
  NV = 0
  PV = 0x747d90 "ff"\0
  CUR = 2
  LEN = 8
ARG+1=8
SV = PVNV(0x72b5f0) at 0x754ae0
  REFCNT = 1
  FLAGS = (PADMY,POK,pPOK)
  IV = 7
  NV = 0
  PV = 0x747d90 "ff"\0
  CUR = 2
  LEN = 8
ARG+1=1

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In reply to Re^2: Mystery state (possibly about whether an argument is numeric?) being maintained across calls to a sub by vsespb
in thread Mystery state (possibly about whether an argument is numeric?) being maintained across calls to a sub by cheesestraws

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