Add fast_type_map, use it authoritatively for local types and as a hint for global types (ABI breaking) #575

	name: Read the Docs PR preview

	on:
	pull_request_target:
	types:
	- opened
	- synchronize

	permissions:
	contents: read
	pull-requests: write

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

	jobs:
	documentation-links:
	runs-on: ubuntu-latest
	if: github.event.repository.fork == false
	steps:
	- uses: actions/checkout@v5

	- name: Check for docs changes
	id: docs_changes
	run: \|
	# Fetch the PR head
	git fetch origin pull/${{ github.event.pull_request.number }}/head:pr-head

	# Show diff between base (current checkout) and PR head
	if git diff --name-only HEAD pr-head \| grep -q '^docs/'; then
	echo "docs_changed=true" >> "$GITHUB_OUTPUT"
	else
	echo "docs_changed=false" >> "$GITHUB_OUTPUT"
	fi

	- uses: readthedocs/actions/preview@v1
	if: steps.docs_changes.outputs.docs_changed == 'true'
	with:
	project-slug: "pybind11"
	single-version: "true"

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