Fix async generators to return AsyncGenerator directly #167

	# name: CI

	# on:
	# push:

	# jobs:
	# ci:
	# timeout-minutes: 30
	# runs-on: ubuntu-latest
	# steps:
	# - uses: actions/checkout@v3
	# with:
	# fetch-depth: 0
	# - uses: actions/setup-node@v3
	# with:
	# node-version: 18
	# registry-url: https://registry.npmjs.org/
	# - uses: pnpm/action-setup@v2
	# with:
	# version: 8
	# run_install: false
	# - name: Install pnpm dependencies (with cache)
	# uses: covbot/pnpm-install-with-cache@v1
	# # scripts
	# - run: pnpm build
	# - run: pnpm test

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