fix: set env,key for string and value for string (denoland#1567)

js/os.ts

@@ -95,8 +95,8 @@ function createEnv(inner: msg.EnvironRes): { [index: string]: string } {
  }
 
  return new Proxy(env, {
- set(obj, prop: string, value: string | number) {
- setEnv(prop, value.toString());
+ set(obj, prop: string, value: string) {
+ setEnv(prop, value);
  return Reflect.set(obj, prop, value);
  }
  });
@@ -115,7 +115,7 @@ function setEnv(key: string, value: string): void {
 
 /** Returns a snapshot of the environment variables at invocation. Mutating a
  * property in the object will set that variable in the environment for
- * the process. The environment object will only accept `string`s or `number`s
+ * the process. The environment object will only accept `string`s
  * as values.
  *
  * import { env } from "deno";