diff --git a/src/utils/common.ts b/src/utils/common.ts
index 753d6ebb865..569f69e132e 100644
--- a/src/utils/common.ts
+++ b/src/utils/common.ts
@@ -341,6 +341,10 @@ export class NumberHolder {
   constructor(value: number) {
     this.value = value;
   }
+
+  valueOf(): number {
+    return this.value;
+  }
 }
 
 export class FixedInt {
@@ -349,6 +353,10 @@ export class FixedInt {
   constructor(value: number) {
     this.value = value;
   }
+
+  [Symbol.toPrimitive](_hint: string): number {
+    return this.value;
+  }
 }
 
 export function fixedInt(value: number): number {