@@ -200,7 +200,9 @@ export default class Matrix {
     if (!Matrix.isValidIndex(this, row, col)) {
       throw new Error("Invalid row or column index.");
     }
-    this.data[row][col] = value;
+    // avoid Prototype-Pollution assisgnment
+    this.data[row] = [...this.data[row].slice(0, col), value, ...this.data[row].slice(col + 1)];
+    // this.data[row][col] = value;
   }
 
   /**
Original file line number	Diff line number	Diff line change
`@@ -200,7 +200,9 @@ export default class Matrix {`
`200`	`200`	`if (!Matrix.isValidIndex(this, row, col)) {`
`201`	`201`	`throw new Error("Invalid row or column index.");`
`202`	`202`	`}`
`203`		`- this.data[row][col] = value;`
	`203`	`+ // avoid Prototype-Pollution assisgnment`
	`204`	`+ this.data[row] = [...this.data[row].slice(0, col), value, ...this.data[row].slice(col + 1)];`
	`205`	`+ // this.data[row][col] = value;`
`204`	`206`	`}`
`205`	`207`
`206`	`208`	`/**`