Arch Linux

Description:
When using curl to get response headers (this is the only behaviour I've noticed it occur in, as that's what I use curl the most for) - but NOT to fetch actual page content - I'm noticing strange bold and underlined characters, necessitating a "reset" command to restore the normal shell prompt. This does not seem to occur when I am capturing the output, either with a shell redirect, pipe, etc.

I have attached a screenshot of this behaviour, since I can't seem to capture the actual ANSI with simple shell mechanisms (I suspect curl is responsible for determining if it's being piped or not?).

This *seems* to have started with the latest update to curl I've performed (on 2018-07-13 18:53) to 7.16.0-1, but I can't be 100% certain on that.

Additional info:
* curl 7.16.0-1

I am using gnome-terminal as my terminal emulator. However, this occurs even in xterm (and even on a TTY, though obviously the rendering looks a bit different).

[bts@cylon ~]$ echo $SHELL
/bin/bash

Bash environment:
LC_ALL=
LC_MEASUREMENT=en_US.UTF-8
LC_PAPER=en_US.UTF-8
LC_MONETARY=en_US.UTF-8
ANDROID_HOME=/opt/android-sdk
XDG_MENU_PREFIX=gnome-
LANG=en_US.UTF-8
GDM_LANG=en_US.UTF-8
DISPLAY=:1
HISTTIMEFORMAT=%F %T
EDITOR=vim
COLORTERM=truecolor
USERNAME=bts
MOZ_PLUGIN_PATH=/usr/lib/mozilla/plugins
XDG_VTNR=2
SSH_AUTH_SOCK=/run/user/1000/keyring/ssh
HG=/usr/bin/hg
LC_NAME=en_US.UTF-8
XDG_SESSION_ID=c2
USER=bts
DESKTOP_SESSION=gnome
LC_COLLATE=en_US.UTF-8
GRADLE_HOME=/usr/share/java/gradle
GNOME_TERMINAL_SCREEN=/org/gnome/Terminal/screen/68d2b95d_3277_45dc_a4e2_e57f670de293
PWD=/home/bts
HOME=/home/bts
LC_CTYPE=en_US.UTF-8
XDG_SESSION_TYPE=x11
XDG_DATA_DIRS=/home/bts/.local/share/flatpak/exports/share/:/var/lib/flatpak/exports/share/:/usr/local/share/:/usr/share/
XDG_SESSION_DESKTOP=gnome
LC_ADDRESS=en_US.UTF-8
GJS_DEBUG_OUTPUT=stderr
LC_NUMERIC=en_US.UTF-8
MAIL=/var/spool/mail/bts
WINDOWPATH=2
TERM=xterm-256color
SHELL=/bin/bash
VTE_VERSION=5202
LC_MESSAGES=en_US.UTF-8
QT_IM_MODULE=ibus
XMODIFIERS=@im=ibus
XDG_CURRENT_DESKTOP=GNOME
GNOME_TERMINAL_SERVICE=:1.84
XDG_SEAT=seat0
SHLVL=1
LC_TELEPHONE=en_US.UTF-8
GDMSESSION=gnome
GNOME_DESKTOP_SESSION_ID=this-is-deprecated
LOGNAME=bts
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
XDG_RUNTIME_DIR=/run/user/1000
XAUTHORITY=/run/user/1000/gdm/Xauthority
PATH=/usr/local/bin:/usr/local/sbin:/usr/bin:/opt/android-sdk/platform-tools:/opt/android-sdk/tools:/opt/android-sdk/tools/bin:/usr/lib/jvm/default/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl:~/bin:/sbin:/bin:/usr/sbin
LC_IDENTIFICATION=en_US.UTF-8
GJS_DEBUG_TOPICS=JS ERROR;JS LOG
SESSION_MANAGER=local/cylon:@/tmp/.ICE-unix/1539,unix/cylon:/tmp/.ICE-unix/1539
LC_TIME=en_US.UTF-8
OLDPWD=/tmp
_=/usr/bin/env

Steps to reproduce:

curl -sIL <ANY_URL>

e.g.:

curl -sIL https://g.rainwreck.com