feature 'extra_paired_delimiters': Please remove U+0706/U+0707 from the list

[HaraldJoerg]

Description

The feature 'extra_paired_delimiters' allows many pairs, at least one of them is likely to cause confusion: U+0706 and U+0707 (SYRIAC COLON SKEWED LEFT and SYRIAC COLON SKEWED RIGHT). These characters have the BIDI property "Right-to-Left Arabic [AL]". Unicode-aware editors and terminals process this property. The consequence: If a character between the delimiters has a left-to-right property, then everything looks normal. However, if the text between the delimiters has only BIDI neutral characters, then this text including the delimiters is displayed as right-to-left. As a special effect, if one of the characters has a "Mirror" property, then the mirrored character is displayed: a "<" is shown with the glyph ">".

Perl is not confused by this, but humans looking at the code might be. Can we please remove this (and maybe other) right-to-left delimiters from the list?

use utf8;
use feature 'extra_paired_delimiters';

my $alphabetic  = q܆a܇; # this is correct
my $punctuation = q܆.܇; # this is also correct but looks backwards

my $weird = q܆<-܇;
print $weird; # prints "<-", because that's actually the value

Perl configuration

# perl -V output goes here

Summary of my perl5 (revision 5 version 39 subversion 11) configuration: Local Commit: 2fc32c2024a28634f5bb168cc671dcf18056620b Ancestor: e3f226d5c6ed541239e77ee339cd04d121da4411 Platform: osname=linux osvers=6.5.0-35-generic archname=x86_64-linux uname='linux hajbuntu 6.5.0-35-generic #35~22.04.1-ubuntu smp preempt_dynamic tue may 7 09:00:52 utc 2 x86_64 x86_64 x86_64 gnulinux ' config_args='-des -Dusedevel -Dprefix=/home/haj/localperl/ -Dman1dir=none -Dman3dir=none' 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' optimize='-O2' cppflags='-fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include' ccversion='' gccversion='11.4.0' 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/x86_64-linux-gnu /usr/lib /usr/lib64 libs=-lpthread -ldl -lm -lcrypt -lutil -lc perllibs=-lpthread -ldl -lm -lcrypt -lutil -lc libc=/lib/x86_64-linux-gnu/libc.so.6 so=so useshrplib=false libperl=libperl.a gnulibc_version='2.35' 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