Write boolean value when saving a form (bug 1729971)

- it aims to fix https://bugzilla.mozilla.org/show_bug.cgi?id=1729971#c4.

src/core/writer.js

@@ -83,10 +83,14 @@ function writeValue(value, buffer, transform) {
     buffer.push(`(${escapeString(value)})`);
   } else if (typeof value === "number") {
     buffer.push(numberToString(value));
+  } else if (typeof value === "boolean") {
+    buffer.push(`${value.toString()}`);
   } else if (isDict(value)) {
     writeDict(value, buffer, transform);
   } else if (isStream(value)) {
     writeStream(value, buffer, transform);
+  } else {
+    warn(`Unhandled value in writer: ${typeof value}, please file a bug.`);
   }
 }
 

test/unit/writer_spec.js

@@ -114,6 +114,8 @@ describe("Writer", function () {
       gdict.set("I", stream);
 
       dict.set("G", gdict);
+      dict.set("J", true);
+      dict.set("K", false);
 
       const buffer = [];
       writeDict(dict, buffer, null);
@@ -123,7 +125,7 @@ describe("Writer", function () {
         "/E (\\(hello\\\\world\\)) /F [1.23 4.5 6] " +
         "/G << /H 123 /I << /Length 8>> stream\n" +
         "a stream\n" +
-        "endstream\n>>>>";
+        "endstream\n>> /J true /K false>>";
 
       expect(buffer.join("")).toEqual(expected);
     });