timeout crates & retain timeoutError object eagerly

[kwonoj]

Bug Report

Current Behavior
A clear and concise description of the behavior.

Reproduction

• REPL or Repo link:
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rx.interval(10).pipe(
  take(3),
  filter(() => false),
  timeout(1000)
).subscribe((x) => { console.log(x) }, null, () => { console.log('complete') });

Expected behavior
above code snippet never timeouts, but inspecting heap will reveal retainer to timeoutError object:

Environment

• Runtime: [e.g. Node v${x}, Chrome v${x}]
• RxJS version:
• (If bug is related) Loader, build configuration: [e.g webpack, angular-cli version, config]

Possible Solution

Additional context/Screenshots
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Discussed with @benlesh and we would like to treat this as bug, avoid creating error object unless actual timeout occurs.