Improved the "x is y" and "type(x) is y" type guards to better handle… #1674

	# This workflow runs mypy_primer, a tool that runs pyright on a variety
	# of open-source Python projects that are known to type check with pyright.
	# It builds pyright from the latest commit and the last release tag and
	# compares the output of both. It uploads the diffs as an artifact.
	name: Run mypy_primer on push

	on:
	# Run on all pushes to main.
	push:
	branches:
	- main
	paths:
	- 'packages/pyright/**'
	- 'packages/pyright-internal/src/**'
	- 'packages/pyright-internal/typeshed-fallback/**'
	# Also run manually if requested.
	workflow_dispatch:

	concurrency:
	group: ${{ github.workflow }}-${{ github.head_ref \|\| github.run_id }}
	cancel-in-progress: true

	jobs:
	mypy_primer:
	name: Run mypy_primer on push
	runs-on: ubuntu-latest
	permissions:
	contents: read
	strategy:
	fail-fast: false
	steps:
	- uses: actions/checkout@v4
	with:
	path: pyright_to_test
	fetch-depth: 0
	- uses: actions/setup-python@v5
	with:
	python-version: '3.10'
	- name: Install dependencies
	run: \|
	python -m pip install -U pip
	pip install git+https://github.com/hauntsaninja/mypy_primer.git
	- name: Run mypy_primer
	shell: bash
	run: \|
	cd pyright_to_test
	echo "new commit"
	git rev-list --format=%s --max-count=1 $GITHUB_SHA

	cd ..
	# fail action if exit code isn't zero or one
	(
	mypy_primer \
	--repo pyright_to_test \
	--type-checker pyright \
	--new $GITHUB_SHA \
	--debug \
	--output concise \
	\| tee diff.txt
	) \|\| [ $? -eq 1 ]
	- name: Upload mypy_primer diff
	uses: actions/upload-artifact@v4
	with:
	name: mypy_primer_diffs
	path: diff.txt

Provide feedback