Ensure that the Widths array is parsed correctly in `PartialEvaluat…

…or.preEvaluateFont`

*Please note:* While I don't have a document that this patches fixes, the current code is however not entirely correct as far as I can tell.

Looking at how the `Widths` array is parsed in `PartialEvaluator.extractWidths`, it's clear that the implementation in `PartialEvaluator.preEvaluateFont` is a bit too simplistic. In particular, by only wrapping the data into a TypedArray, there's no attempt to handle *indirect* objects which could potentially lead to colliding `hash`es being computed.

src/core/evaluator.js

@@ -3608,10 +3608,15 @@ class PartialEvaluator {
         hash.update(toUnicode.name);
       }
 
-      var widths = dict.get("Widths") || baseDict.get("Widths");
-      if (widths) {
-        uint8array = new Uint8Array(new Uint32Array(widths).buffer);
-        hash.update(uint8array);
+      const widths = dict.get("Widths") || baseDict.get("Widths");
+      if (Array.isArray(widths)) {
+        const widthsBuf = [];
+        for (const entry of widths) {
+          if (isNum(entry) || isRef(entry)) {
+            widthsBuf.push(entry.toString());
+          }
+        }
+        hash.update(widthsBuf.join());
       }
 
       if (composite) {