fix: "filter is not a function" for uniq

src/util/limiter.ts

@@ -1,4 +1,5 @@
 import { assert } from './assert'
+import { toNumber } from './underscore'
 
 export class Limiter {
   private message: string
@@ -9,10 +10,12 @@ export class Limiter {
     this.limit = limit
   }
   use (count: number) {
+    count = toNumber(count)
     assert(this.base + count <= this.limit, this.message)
     this.base += count
   }
   check (count: number) {
+    count = toNumber(count)
     assert(count <= this.limit, this.message)
   }
 }

src/util/underscore.ts

@@ -66,6 +66,11 @@ export function toValue (value: any): any {
   return (value instanceof Drop && isFunction(value.valueOf)) ? value.valueOf() : value
 }
 
+export function toNumber (value: any): number {
+  value = Number(value)
+  return isNaN(value) ? 0 : value
+}
+
 export function isNumber (value: any): value is number {
   return typeof value === 'number'
 }