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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

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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