diff --git a/src/__tests__/url-encode.spec.ts b/src/__tests__/url-encode.spec.ts
index 22272ddd..384f3bcc 100644
--- a/src/__tests__/url-encode.spec.ts
+++ b/src/__tests__/url-encode.spec.ts
@@ -134,6 +134,15 @@ describe('URL encoder', () => {
     const expected = ['3/2', 'foo', 'BAR', '2/1']
     expect(arraysEqual(decodeLines('3F2_EfEoEo_EBAER_2F1'), expected)).toBeTruthy()
   })
+
+  it('can encode repeated L characters in invalid lines', () => {
+    const lines = ['sLL', '9/8', '3/2', '2/1']
+    expect(encodeLines(lines)).toBe('EsELEL_9F8_3F2_2F1')
+  })
+
+  it('can decode repeated L characters in invalid lines', () => {
+    expect(decodeLines('EsELEL_9F8_3F2_2F1')).toEqual(['sLL', '9/8', '3/2', '2/1'])
+  })
 })
 
 describe('URL decoder', () => {
diff --git a/src/url-encode.ts b/src/url-encode.ts
index fbc51876..aee71047 100644
--- a/src/url-encode.ts
+++ b/src/url-encode.ts
@@ -80,15 +80,15 @@ function decodeDigits(digits: string) {
 
 function encodeLine(scaleLine: string) {
   scaleLine = scaleLine
-    .replace(ESCAPE, ESCAPE + ESCAPE)
-    .replace(FRACTION, ESCAPE + FRACTION)
-    .replace(COMMA, ESCAPE + COMMA)
-    .replace(BACKSLASH, ESCAPE + BACKSLASH)
-    .replace(SPACE, ESCAPE + SPACE)
-    .replace(LEFT_ANGLE_BRACKET, ESCAPE + LEFT_ANGLE_BRACKET)
-    .replace(RIGHT_ANGLE_BRACKET, ESCAPE + RIGHT_ANGLE_BRACKET)
-    .replace(LEFT_SQUARE_BRACKET, ESCAPE + LEFT_SQUARE_BRACKET)
-    .replace(PLUS, ESCAPE + PLUS)
+    .replaceAll(ESCAPE, ESCAPE + ESCAPE)
+    .replaceAll(FRACTION, ESCAPE + FRACTION)
+    .replaceAll(COMMA, ESCAPE + COMMA)
+    .replaceAll(BACKSLASH, ESCAPE + BACKSLASH)
+    .replaceAll(SPACE, ESCAPE + SPACE)
+    .replaceAll(LEFT_ANGLE_BRACKET, ESCAPE + LEFT_ANGLE_BRACKET)
+    .replaceAll(RIGHT_ANGLE_BRACKET, ESCAPE + RIGHT_ANGLE_BRACKET)
+    .replaceAll(LEFT_SQUARE_BRACKET, ESCAPE + LEFT_SQUARE_BRACKET)
+    .replaceAll(PLUS, ESCAPE + PLUS)
 
   scaleLine = scaleLine
     .replace(/\//g, FRACTION)
diff --git a/tsconfig.app.json b/tsconfig.app.json
index 3b26808e..5376aaef 100644
--- a/tsconfig.app.json
+++ b/tsconfig.app.json
@@ -8,6 +8,7 @@
     "baseUrl": ".",
     "paths": {
       "@/*": ["./src/*"]
-    }
+    },
+    "lib": ["es2021"]
   }
 }
diff --git a/tsconfig.node.json b/tsconfig.node.json
index dee96bed..8b65c67f 100644
--- a/tsconfig.node.json
+++ b/tsconfig.node.json
@@ -11,6 +11,7 @@
     "composite": true,
     "module": "ESNext",
     "moduleResolution": "Bundler",
-    "types": ["node"]
+    "types": ["node"],
+    "lib": ["es2021"]
   }
 }
diff --git a/tsconfig.vitest.json b/tsconfig.vitest.json
index d5757a62..cf2377fe 100644
--- a/tsconfig.vitest.json
+++ b/tsconfig.vitest.json
@@ -4,7 +4,6 @@
   "exclude": [],
   "compilerOptions": {
     "composite": true,
-    "lib": [],
     "types": ["node", "jsdom"]
   }
 }