"Lost precision" warnings on increment/decrement

[t-a-k]

Description

"Lost precision when incrementing ... by 1" warning on increment seems to be limited to the case that the target value was positive finite value; infinity or negative large value are not warned. (Similarly, infinity or positive large value are not warned on decrement.)
I think this is somewhat inconsistent.

Steps to Reproduce

$ perl -we 'my $x = 10 ** 300; my $y = $x++; printf "%a -> %a\n", $y, $x'
Lost precision when incrementing 100000 (snip) 540160.000000 by 1 at -e line 1.
0x1.7e43c8800759cp+996 -> 0x1.7e43c8800759cp+996
$ perl -we 'my $x = 10 ** 400; my $y = $x++; printf "%a -> %a\n", $y, $x'
Inf -> Inf
$ perl -we 'my $x = -10 ** 300; my $y = $x++; printf "%a -> %a\n", $y, $x'
-0x1.7e43c8800759cp+996 -> -0x1.7e43c8800759cp+996

The second and third example above shows that target variable are not changed, but no warnings are generated.

Expected behavior

I expect that perl will warn if increment cannot change the value even for infinite or negative values, and for decrement, warn even for infinite or positive values.

Perl configuration

Summary of my perl5 (revision 5 version 33 subversion 4) configuration:
  Commit id: 185eb2d3f6e86edc749ad9b20f1b6a1e0b231ad7
  Platform:
    osname=linux
    osvers=4.19.0-12-686-pae
    archname=i686-linux
    uname='linux x41 4.19.0-12-686-pae #1 smp debian 4.19.152-1 (2020-10-18) i686 gnulinux '
    config_args='-de -Dusedevel -DEBUGGING'
    hint=recommended
    useposix=true
    d_sigaction=define
    useithreads=undef
    usemultiplicity=undef
    use64bitint=undef
    use64bitall=undef
    uselongdouble=undef
    usemymalloc=n
    default_inc_excludes_dot=define
  Compiler:
    cc='cc'
    ccflags ='-fwrapv -DDEBUGGING -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 -g'
    cppflags='-fwrapv -DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
    ccversion=''
    gccversion='8.3.0'
    gccosandvers=''
    intsize=4
    longsize=4
    ptrsize=4
    doublesize=8
    byteorder=1234
    doublekind=3
    d_longlong=define
    longlongsize=8
    d_longdbl=define
    longdblsize=12
    longdblkind=3
    ivtype='long'
    ivsize=4
    nvtype='double'
    nvsize=8
    Off_t='off_t'
    lseeksize=8
    alignbytes=4
    prototype=define
  Linker and Libraries:
    ld='cc'
    ldflags =' -fstack-protector-strong -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib/gcc/i686-linux-gnu/8/include-fixed /usr/include/i386-linux-gnu /usr/lib /lib/i386-linux-gnu /lib/../lib /usr/lib/i386-linux-gnu /usr/lib/../lib /lib /lib64 /usr/lib64
    libs=-lpthread -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
    perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
    libc=libc-2.28.so
    so=so
    useshrplib=false
    libperl=libperl.a
    gnulibc_version='2.28'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs
    dlext=so
    d_dlsymun=undef
    ccdlflags='-Wl,-E'
    cccdlflags='-fPIC'
    lddlflags='-shared -O2 -g -L/usr/local/lib -fstack-protector-strong'


Characteristics of this binary (from libperl): 
  Compile-time options:
    DEBUGGING
    HAS_TIMES
    PERLIO_LAYERS
    PERL_COPY_ON_WRITE
    PERL_DONT_CREATE_GVSV
    PERL_MALLOC_WRAP
    PERL_OP_PARENT
    PERL_PRESERVE_IVUV
    PERL_USE_DEVEL
    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 Nov 15 2020 18:25:29
  @INC:
    /usr/local/lib/perl5/site_perl/5.33.4/i686-linux
    /usr/local/lib/perl5/site_perl/5.33.4
    /usr/local/lib/perl5/5.33.4/i686-linux
    /usr/local/lib/perl5/5.33.4