fix: handle Auto delimiter correctly in fromDecimal

When delim is "Auto", Utils.charRep("Auto") returns undefined,
causing data.split(undefined) to return the entire string as a
single element. This meant only the first number was parsed.

Fix by splitting on a regex /[^\d-]+/ for Auto mode, consistent
with how fromHex handles its Auto delimiter. Existing delimiter
behavior is unchanged.

Adds test cases for Auto delimiter with space, comma, and mixed
separators.

Fixes #2217
Ref: #2221 (closed due to unsigned CLA)

src/core/lib/Decimal.mjs

@@ -24,12 +24,17 @@ import Utils from "../Utils.mjs";
  * fromDecimal("10:20:30", "Colon");
  */
 export function fromDecimal(data, delim="Auto") {
-    delim = Utils.charRep(delim);
+    let byteStr;
-    const output = [];
+    if (delim === "Auto") {
-    let byteStr = data.split(delim);
+        byteStr = data.split(/[^\d-]+/);
-    if (byteStr[byteStr.length-1] === "")
+    } else {
-        byteStr = byteStr.slice(0, byteStr.length-1);
+        delim = Utils.charRep(delim);
+        byteStr = data.split(delim);
+    }
 
+    byteStr = byteStr.filter(str => str !== "");
+
+    const output = [];
     for (let i = 0; i < byteStr.length; i++) {
         output[i] = parseInt(byteStr[i], 10);
     }

tests/operations/tests/FromDecimal.mjs

@@ -30,4 +30,37 @@ TestRegister.addTests([
             },
         ],
     },
+    {
+        name: "From Decimal with Auto delimiter (space)",
+        input: "72 101 108 108 111",
+        expectedOutput: "Hello",
+        recipeConfig: [
+            {
+                op: "From Decimal",
+                args: ["Auto", false]
+            },
+        ],
+    },
+    {
+        name: "From Decimal with Auto delimiter (comma)",
+        input: "72,101,108,108,111",
+        expectedOutput: "Hello",
+        recipeConfig: [
+            {
+                op: "From Decimal",
+                args: ["Auto", false]
+            },
+        ],
+    },
+    {
+        name: "From Decimal with Auto delimiter (mixed)",
+        input: "72, 101 : 108; 108\t111",
+        expectedOutput: "Hello",
+        recipeConfig: [
+            {
+                op: "From Decimal",
+                args: ["Auto", false]
+            },
+        ],
+    },
 ]);