builtin::trim return value numifies incorrectly in a loop

[Grinnz]

Description
When used in a foreach loop, builtin::trim returns the same PV in subsequent iterations which then numifies to the same IV as in the first loop even though the PV has changed.

Reported by damien on IRC

Steps to Reproduce

perl -Mv5.40 -MDevel::Peek -E'for my $i ("4" .. "5") { Dump builtin::trim($i); Dump 0+builtin::trim($i) }'

SV = PV(0xd61dbc0) at 0xd65ba58
  REFCNT = 1
  FLAGS = (PADTMP,POK,pPOK)
  PV = 0xd5cce70 "4"\0
  CUR = 1
  LEN = 16
SV = IV(0xd65b970) at 0xd65b980
  REFCNT = 1
  FLAGS = (PADTMP,IOK,pIOK)
  IV = 4
SV = PV(0xd61dbc0) at 0xd65ba58
  REFCNT = 1
  FLAGS = (PADTMP,POK,pPOK)
  PV = 0xd5cce70 "5"\0
  CUR = 1
  LEN = 16
SV = IV(0xd65b970) at 0xd65b980
  REFCNT = 1
  FLAGS = (PADTMP,IOK,pIOK)
  IV = 4

Expected behavior
outputting a PV of '4', IV of 4, PV of '5', and IV of 5

Perl configuration

Summary of my perl5 (revision 5 version 40 subversion 0) configuration:
   
  Platform:
    osname=linux
    osvers=6.3.8-200.fc38.x86_64
    archname=x86_64-linux
    uname='linux home.grinnz.com 6.3.8-200.fc38.x86_64 #1 smp preempt_dynamic thu jun 15 02:15:40 utc 2023 x86_64 gnulinux '
    config_args='-Dprefix=/home/grinnz/.plenv/versions/5.40.0 -de -Dversiononly -A'eval:scriptdir=/home/grinnz/.plenv/versions/5.40.0/bin''
    hint=recommended
    useposix=true
    d_sigaction=define
    useithreads=undef
    usemultiplicity=undef
    use64bitint=define
    use64bitall=define
    uselongdouble=undef
    usemymalloc=n
    default_inc_excludes_dot=define
  Compiler:
    cc='cc'
    ccflags ='-fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2'
    optimize='-O2'
    cppflags='-fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
    ccversion=''
    gccversion='13.2.1 20231011 (Red Hat 13.2.1-4)'
    gccosandvers=''
    intsize=4
    longsize=8
    ptrsize=8
    doublesize=8
    byteorder=12345678
    doublekind=3
    d_longlong=define
    longlongsize=8
    d_longdbl=define
    longdblsize=16
    longdblkind=3
    ivtype='long'
    ivsize=8
    nvtype='double'
    nvsize=8
    Off_t='off_t'
    lseeksize=8
    alignbytes=8
    prototype=define
  Linker and Libraries:
    ld='cc'
    ldflags =' -fstack-protector-strong -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib /usr/lib64 /usr/local/lib64
    libs=-lpthread -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
    perllibs=-lpthread -ldl -lm -lcrypt -lutil -lc
    libc=/lib/../lib64/libc.so.6
    so=so
    useshrplib=false
    libperl=libperl.a
    gnulibc_version='2.37'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs
    dlext=so
    d_dlsymun=undef
    ccdlflags='-Wl,-E'
    cccdlflags='-fPIC'
    lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector-strong'
 
 
Characteristics of this binary (from libperl):
  Compile-time options:
    HAS_LONG_DOUBLE
    HAS_STRTOLD
    HAS_TIMES
    PERLIO_LAYERS
    PERL_COPY_ON_WRITE
    PERL_DONT_CREATE_GVSV
    PERL_HASH_FUNC_SIPHASH13
    PERL_HASH_USE_SBOX32
    PERL_MALLOC_WRAP
    PERL_OP_PARENT
    PERL_PRESERVE_IVUV
    PERL_USE_SAFE_PUTENV
    USE_64_BIT_ALL
    USE_64_BIT_INT
    USE_LARGE_FILES
    USE_LOCALE
    USE_LOCALE_COLLATE
    USE_LOCALE_CTYPE
    USE_LOCALE_NUMERIC
    USE_LOCALE_TIME
    USE_PERLIO
    USE_PERL_ATOF
  Built under linux
  Compiled at Jun 10 2024 21:21:12
  @INC:
    /home/grinnz/.plenv/versions/5.40.0/lib/perl5/site_perl/5.40.0/x86_64-linux
    /home/grinnz/.plenv/versions/5.40.0/lib/perl5/site_perl/5.40.0
    /home/grinnz/.plenv/versions/5.40.0/lib/perl5/5.40.0/x86_64-linux
    /home/grinnz/.plenv/versions/5.40.0/lib/perl5/5.40.0

[tonycoz]

It's not just for():

 ./perl -Ilib  -Mbuiltin=trim -le 'sub f { print 0+trim($_[0]); } f(4); f(123)'
4
4

I expect it's TARG not being properly reset, looking into it.