diff --git a/spec/strategies/completion_spec.rb b/spec/strategies/completion_spec.rb
index bd2c72d..e8cc8ce 100644
--- a/spec/strategies/completion_spec.rb
+++ b/spec/strategies/completion_spec.rb
@@ -4,7 +4,7 @@ describe 'the `completion` suggestion strategy' do
     -> do
       session.
         run_command('autoload compinit && compinit').
-        run_command('_foo() { compadd bar }').
+        run_command('_foo() { compadd bar; compadd bat }').
         run_command('compdef _foo baz')
     end
   end
@@ -14,6 +14,12 @@ describe 'the `completion` suggestion strategy' do
     wait_for { session.content }.to eq('baz bar')
   end
 
+  it 'does not add extra carriage returns when prefix has a line feed' do
+    skip '`stty` does not work inside zpty below zsh version 5.0.3' if session.zsh_version < Gem::Version.new('5.0.3')
+    session.send_string('baz \\').send_keys('C-v', 'C-j')
+    wait_for { session.content }.to eq("baz \\\nbar")
+  end
+
   context 'when async mode is enabled' do
     let(:options) { ['ZSH_AUTOSUGGEST_USE_ASYNC=true', 'ZSH_AUTOSUGGEST_STRATEGY=completion'] }
 
@@ -21,6 +27,12 @@ describe 'the `completion` suggestion strategy' do
       session.send_string('baz ')
       wait_for { session.content }.to eq('baz bar')
     end
+
+    it 'does not add extra carriage returns when prefix has a line feed' do
+      skip '`stty` does not work inside zpty below zsh version 5.0.3' if session.zsh_version < Gem::Version.new('5.0.3')
+      session.send_string('baz \\').send_keys('C-v', 'C-j')
+      wait_for { session.content }.to eq("baz \\\nbar")
+    end
   end
 end
 
diff --git a/src/async.zsh b/src/async.zsh
index b038cb0..d7e9fe8 100644
--- a/src/async.zsh
+++ b/src/async.zsh
@@ -56,9 +56,12 @@ _zsh_autosuggest_async_request() {
 _zsh_autosuggest_async_response() {
 	emulate -L zsh
 
+	local suggestion
+
 	if [[ -z "$2" || "$2" == "hup" ]]; then
 		# Read everything from the fd and give it as a suggestion
-		zle autosuggest-suggest -- "$(cat <&$1)"
+		IFS='' read -rd '' -u $1 suggestion
+		zle autosuggest-suggest -- "$suggestion"
 
 		# Close the fd
 		exec {1}<&-
diff --git a/src/strategies/completion.zsh b/src/strategies/completion.zsh
index bf4ed9a..4c60e90 100644
--- a/src/strategies/completion.zsh
+++ b/src/strategies/completion.zsh
@@ -10,10 +10,13 @@ _zsh_autosuggest_capture_postcompletion() {
 	compstate[insert]=1
 
 	# Don't list completions
-	unset compstate[list]
+	unset 'compstate[list]'
 }
 
 _zsh_autosuggest_capture_completion_widget() {
+	# Add a post-completion hook to be called after all completions have been
+	# gathered. The hook can modify compstate to affect what is done with the
+	# gathered completions.
 	local -a +h comppostfuncs
 	comppostfuncs=(_zsh_autosuggest_capture_postcompletion)
 
@@ -25,6 +28,16 @@ _zsh_autosuggest_capture_completion_widget() {
 	# after autosuggestions is initialized.
 	zle -- ${(k)widgets[(r)completion:.complete-word:_main_complete]}
 
+	if is-at-least 5.0.3; then
+		# Don't do any cr/lf transformations. We need to do this immediately before
+		# output because if we do it in setup, onlcr will be re-enabled when we enter
+		# vared in the async code path. There is a bug in zpty module in older versions
+		# where the tty is not properly attached to the pty slave, resulting in stty
+		# getting stopped with a SIGTTOU. See zsh-workers thread 31660 and upstream
+		# commit f75904a38
+		stty -onlcr -ocrnl -F /dev/tty
+	fi
+
 	# The completion has been added, print the buffer as the suggestion
 	echo -nE - $'\0'$BUFFER$'\0'
 }
@@ -32,6 +45,8 @@ _zsh_autosuggest_capture_completion_widget() {
 zle -N autosuggest-capture-completion _zsh_autosuggest_capture_completion_widget
 
 _zsh_autosuggest_capture_setup() {
+	autoload -Uz is-at-least
+
 	# There is a bug in zpty module in older zsh versions by which a
 	# zpty that exits will kill all zpty processes that were forked
 	# before it. Here we set up a zsh exit hook to SIGKILL the zpty
@@ -39,8 +54,12 @@ _zsh_autosuggest_capture_setup() {
 	# zpty processes.
 	if ! is-at-least 5.4; then
 		zshexit() {
-			kill -KILL $$
-			sleep 1 # Block for long enough for the signal to come through
+			# The zsh builtin `kill` fails sometimes in older versions
+			# https://unix.stackexchange.com/a/477647/156673
+			kill -KILL $$ 2>&- || command kill -KILL $$
+
+			# Block for long enough for the signal to come through
+			sleep 1
 		}
 	fi
 
@@ -99,9 +118,11 @@ _zsh_autosuggest_strategy_completion() {
 		# content between the first two null bytes.
 		zpty -r $ZSH_AUTOSUGGEST_COMPLETIONS_PTY_NAME line '*'$'\0''*'$'\0'
 
-		# On older versions of zsh, we sometimes get extra bytes after the
-		# second null byte, so trim those off the end
-		suggestion="${${${(M)line:#*$'\0'*$'\0'*}#*$'\0'}%%$'\0'*}"
+		# Extract the suggestion from between the null bytes.  On older
+		# versions of zsh (older than 5.3), we sometimes get extra bytes after
+		# the second null byte, so trim those off the end.
+		# See http://www.zsh.org/mla/workers/2015/msg03290.html
+		suggestion="${${line#*$'\0'}%$'\0'*}"
 	} always {
 		# Destroy the pty
 		zpty -d $ZSH_AUTOSUGGEST_COMPLETIONS_PTY_NAME
diff --git a/zsh-autosuggestions.zsh b/zsh-autosuggestions.zsh
index f2fe337..5f2401d 100644
--- a/zsh-autosuggestions.zsh
+++ b/zsh-autosuggestions.zsh
@@ -492,10 +492,13 @@ _zsh_autosuggest_capture_postcompletion() {
 	compstate[insert]=1
 
 	# Don't list completions
-	unset compstate[list]
+	unset 'compstate[list]'
 }
 
 _zsh_autosuggest_capture_completion_widget() {
+	# Add a post-completion hook to be called after all completions have been
+	# gathered. The hook can modify compstate to affect what is done with the
+	# gathered completions.
 	local -a +h comppostfuncs
 	comppostfuncs=(_zsh_autosuggest_capture_postcompletion)
 
@@ -507,6 +510,16 @@ _zsh_autosuggest_capture_completion_widget() {
 	# after autosuggestions is initialized.
 	zle -- ${(k)widgets[(r)completion:.complete-word:_main_complete]}
 
+	if is-at-least 5.0.3; then
+		# Don't do any cr/lf transformations. We need to do this immediately before
+		# output because if we do it in setup, onlcr will be re-enabled when we enter
+		# vared in the async code path. There is a bug in zpty module in older versions
+		# where the tty is not properly attached to the pty slave, resulting in stty
+		# getting stopped with a SIGTTOU. See zsh-workers thread 31660 and upstream
+		# commit f75904a38
+		stty -onlcr -ocrnl -F /dev/tty
+	fi
+
 	# The completion has been added, print the buffer as the suggestion
 	echo -nE - $'\0'$BUFFER$'\0'
 }
@@ -514,6 +527,8 @@ _zsh_autosuggest_capture_completion_widget() {
 zle -N autosuggest-capture-completion _zsh_autosuggest_capture_completion_widget
 
 _zsh_autosuggest_capture_setup() {
+	autoload -Uz is-at-least
+
 	# There is a bug in zpty module in older zsh versions by which a
 	# zpty that exits will kill all zpty processes that were forked
 	# before it. Here we set up a zsh exit hook to SIGKILL the zpty
@@ -521,8 +536,12 @@ _zsh_autosuggest_capture_setup() {
 	# zpty processes.
 	if ! is-at-least 5.4; then
 		zshexit() {
-			kill -KILL $$
-			sleep 1 # Block for long enough for the signal to come through
+			# The zsh builtin `kill` fails sometimes in older versions
+			# https://unix.stackexchange.com/a/477647/156673
+			kill -KILL $$ 2>&- || command kill -KILL $$
+
+			# Block for long enough for the signal to come through
+			sleep 1
 		}
 	fi
 
@@ -581,9 +600,11 @@ _zsh_autosuggest_strategy_completion() {
 		# content between the first two null bytes.
 		zpty -r $ZSH_AUTOSUGGEST_COMPLETIONS_PTY_NAME line '*'$'\0''*'$'\0'
 
-		# On older versions of zsh, we sometimes get extra bytes after the
-		# second null byte, so trim those off the end
-		suggestion="${${${(M)line:#*$'\0'*$'\0'*}#*$'\0'}%%$'\0'*}"
+		# Extract the suggestion from between the null bytes.  On older
+		# versions of zsh (older than 5.3), we sometimes get extra bytes after
+		# the second null byte, so trim those off the end.
+		# See http://www.zsh.org/mla/workers/2015/msg03290.html
+		suggestion="${${line#*$'\0'}%$'\0'*}"
 	} always {
 		# Destroy the pty
 		zpty -d $ZSH_AUTOSUGGEST_COMPLETIONS_PTY_NAME
@@ -758,9 +779,12 @@ _zsh_autosuggest_async_request() {
 _zsh_autosuggest_async_response() {
 	emulate -L zsh
 
+	local suggestion
+
 	if [[ -z "$2" || "$2" == "hup" ]]; then
 		# Read everything from the fd and give it as a suggestion
-		zle autosuggest-suggest -- "$(cat <&$1)"
+		IFS='' read -rd '' -u $1 suggestion
+		zle autosuggest-suggest -- "$suggestion"
 
 		# Close the fd
 		exec {1}<&-