Object instances that are piped are corrupted in versions > 2.0.0-beta.2

[bitofbreeze]

Upgrading from 2.0.0-beta.2 to 2.0.4, my code that checks Cloudflare worker context:

type({
  KV: "object" as type.cast<KVNamespace>,
})
.pipe((env) => ({ ...env })
.assert(
  context.cloudflare.env,
);

used to produce the following type that is an instance of ProxyStub:

KV: ProxyStub { name: 'KvNamespace', poisoned: false },

but now produces this:

KV: [Object: null prototype] {},

I've confirmed the call to .pipe is the issue since removing it produces the correct result again. However, the call to .pipe did not corrupt the object in versions <= 2.0.0-beta.2, so this is clearly a bug.

For some added context, I have filed a similar issue in typebox owing to its Clone step: sinclairzx81/typebox#1186