diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7405513f..4a4029ea 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -111,6 +111,10 @@ jobs:
       shell: bash
       run: git config --global --add safe.directory ${GITHUB_WORKSPACE} && cmake -E make_directory build
 
+    - name: Install zlib
+      shell: bash
+      run: git clone https://github.com/madler/zlib.git zlib && cd zlib && nmake -f win32\Makefile.msc
+
     - name: Configure CMake
       working-directory: build
       shell: bash
diff --git a/ChangeLog b/ChangeLog
index 13bc5541..29a2a944 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -57,9 +57,7 @@ Changes
   `GS1SYNTAXENGINE_MODE` (CLI --gs1strict, GUI "GS1 Strict" checkbox)
 - GS1_MODE: allow GS1 Digital Link URIs (no validation unless
   `GS1SYNTAXENGINE_MODE` set)
-- CLI: --gs1parens, --gs1nocheck and --gs1strict now imply --gs1;
-  --gs1parens no longer requires --esc if AI data includes backslashed
-  parentheses
+- CLI: --gs1parens, --gs1nocheck and --gs1strict now imply --gs1
 
 Bugs
 ----
diff --git a/backend_qt/qzint.cpp b/backend_qt/qzint.cpp
index 913f2686..7f3d9e57 100644
--- a/backend_qt/qzint.cpp
+++ b/backend_qt/qzint.cpp
@@ -1362,16 +1362,16 @@ namespace Zint {
         arg_bool(cmd, "--fullmultibyte", supportsFullMultibyte() && (option3() & 0xFF) == ZINT_FULL_MULTIBYTE);
 
         if (supportsGS1()) {
-            bool done_gs1 = false;
+            bool gs1_implied = false;
             if (gs1Parens() || (inputMode() & GS1PARENS_MODE)) {
-                arg_bool(cmd, "--gs1parens", (done_gs1 = true));
+                arg_bool(cmd, "--gs1parens", (gs1_implied = true));
             }
             if (gs1NoCheck() || (inputMode() & GS1NOCHECK_MODE)) {
-                arg_bool(cmd, "--gs1nocheck", (done_gs1 = true));
+                arg_bool(cmd, "--gs1nocheck", (gs1_implied = true));
             } else if (gs1SyntaxEngine() || (inputMode() & GS1SYNTAXENGINE_MODE)) {
-                arg_bool(cmd, "--gs1strict", (done_gs1 = true));
+                arg_bool(cmd, "--gs1strict", (gs1_implied = true));
             }
-            arg_bool(cmd, "--gs1", (inputMode() & 0x07) == GS1_MODE && !done_gs1);
+            arg_bool(cmd, "--gs1", (inputMode() & 0x07) == GS1_MODE && !gs1_implied);
             arg_bool(cmd, "--gssep", gsSep());
         }
 
diff --git a/docs/manual.html b/docs/manual.html
index 13505c2d..b37a8d01 100644
--- a/docs/manual.html
+++ b/docs/manual.html
@@ -2582,8 +2582,8 @@ Modes and ECI</a> below.</p>
 <p>GS1 data can be encoded in a number of symbologies. Application
 Identifiers (AIs) should be enclosed in <code>[square brackets]</code>
 followed by the data to be encoded (see <a href="#gs1-128">6.1.10.3
-GS1-128</a>). For matrix symbologies, GS1 Digital Link URIs are also
-supported. To encode GS1 data use the <code>--gs1</code> option.
+GS1-128</a>). For matrix symbologies, GS1 Digital Link URIs can also be
+given. To encode GS1 data use the <code>--gs1</code> option.
 Alternatively, use the <code>--gs1strict</code> option, which strictly
 verifies the GS1 data.</p>
 <p>GS1 mode is assumed (and doesn’t need to be set) for GS1-128, EAN-14,
diff --git a/docs/manual.pmd b/docs/manual.pmd
index 3633f206..29c1ce38 100644
--- a/docs/manual.pmd
+++ b/docs/manual.pmd
@@ -1281,7 +1281,7 @@ Interpretations) mechanism to encode the data if the symbology supports it - see
 GS1 data can be encoded in a number of symbologies. Application Identifiers
 (AIs) should be enclosed in `[square brackets]` followed by the data to be
 encoded (see [6.1.10.3 GS1-128]). For matrix symbologies, GS1 Digital Link URIs
-are also supported. To encode GS1 data use the `--gs1` option. Alternatively,
+can also be given. To encode GS1 data use the `--gs1` option. Alternatively,
 use the `--gs1strict` option, which strictly verifies the GS1 data.
 
 GS1 mode is assumed (and doesn't need to be set) for GS1-128, EAN-14, GS1
diff --git a/docs/manual.txt b/docs/manual.txt
index f8338eaa..adfce623 100644
--- a/docs/manual.txt
+++ b/docs/manual.txt
@@ -1353,8 +1353,8 @@ Interpretations) mechanism to encode the data if the symbology supports it - see
 
 GS1 data can be encoded in a number of symbologies. Application Identifiers
 (AIs) should be enclosed in [square brackets] followed by the data to be encoded
-(see 6.1.10.3 GS1-128). For matrix symbologies, GS1 Digital Link URIs are also
-supported. To encode GS1 data use the --gs1 option. Alternatively, use the
+(see 6.1.10.3 GS1-128). For matrix symbologies, GS1 Digital Link URIs can also
+be given. To encode GS1 data use the --gs1 option. Alternatively, use the
 --gs1strict option, which strictly verifies the GS1 data.
 
 GS1 mode is assumed (and doesn’t need to be set) for GS1-128, EAN-14, GS1