diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index dccb26da3..ec810c320 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -371,11 +371,16 @@ jobs:
             # via the `run-extended-tests` label. No staticlib dependency to
             # build (no integration tests).
             #
-            # Each crate's test binary statically links the whole runtime, so
-            # building many at once OOMs the runner (same reason the FULL path
-            # uses CARGO_BUILD_JOBS=1). Serialize here too, and drop crates with
-            # no `src/` unit tests (their lib test binary has zero tests yet
-            # still pays the heavy link).
+            # Run each crate in its OWN `cargo test` invocation — NOT one
+            # multi-package invocation. Building several crates together unifies
+            # perry-runtime's cargo features, which turns on optional impls (e.g.
+            # `fetch`) whose extern symbols (`js_fetch_with_options`) live in a
+            # separate crate the other test binaries don't link → `undefined
+            # reference` at link. Per-package builds keep each crate's
+            # perry-runtime feature set isolated. CARGO_BUILD_JOBS=1 also bounds
+            # the heavy per-binary runtime link so the runner doesn't OOM.
+            # `--with-tests` drops crates whose `src/` has no unit tests (their
+            # lib test binary would link the runtime for zero tests).
             export CARGO_BUILD_JOBS=1
             # perry-runtime first, single-threaded (process-global state); it is
             # a lib-only crate, so filter to --lib.
@@ -385,20 +390,19 @@ jobs:
             rest="$(printf '%s\n' "$scope" | grep -vx 'perry-runtime' \
               | python3 scripts/ci_test_scope.py --with-tests || true)"
             echo "Crates with unit tests in scope:"; printf '%s\n' "$rest"
-            if [ -n "$rest" ]; then
-              # One invocation across the rest of the scope. `cargo test --lib`
-              # errors if NO selected package has a library (a perry-only diff →
-              # just the bin-only `perry` crate), so include --lib only when some
-              # selected crate has one; --bins is always safe.
-              pkg_args="$(printf '%s\n' "$rest" | sed 's/^/-p /' | tr '\n' ' ')"
-              if printf '%s\n' "$rest" | python3 scripts/ci_test_scope.py --has-lib; then
+            for package in $rest; do
+              # `cargo test --lib` errors on a bin-only crate (perry), so pick
+              # the target filter per package: --lib --bins when it has a lib
+              # (lenient if it has no bins), else --bins.
+              if printf '%s\n' "$package" | python3 scripts/ci_test_scope.py --has-lib; then
                 target_filter="--lib --bins"
               else
                 target_filter="--bins"
               fi
-              echo "Running: cargo test $target_filter $pkg_args"
-              cargo test $target_filter $pkg_args
-            fi
+              echo "::group::cargo test $target_filter -p $package"
+              cargo test $target_filter -p "$package"
+              echo "::endgroup::"
+            done
           fi
 
   # ---------------------------------------------------------------------------
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5a7e42c06..dfc1d2441 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,28 @@
+## v0.5.1187 — fix(ci): per-PR cargo-test — per-package runs + don't fan into FFI shims (feature-unification link errors)
+
+Follow-up to #5411/#5413. Two more issues made the fast per-PR path fail on
+foundational diffs (#5402):
+
+1. **Feature-unification link errors.** Testing several crates in ONE
+   `cargo test --lib --bins -p A -p B ...` invocation unifies perry-runtime's
+   cargo features across them. A crate that enables an optional impl (e.g.
+   `fetch`) turns on perry-runtime's reference to `js_fetch_with_options`, whose
+   definition lives in a *separate* crate (perry-ext-fetch / perry-stdlib) that
+   the other test binaries don't link → `undefined reference` at link. Fix: run
+   **each crate in its own `cargo test` invocation** so feature sets stay isolated
+   (mirrors how the pre-#5411 job looped per-package).
+2. **Over-broad fan-out.** A perry-runtime change reverse-dep-closured into ~40
+   FFI-shim crates (`perry-ext-*`, perry-stdlib), each triggering a perry-runtime
+   feature rebuild. Those crates' UNIT tests are self-contained pure-Rust logic
+   that don't exercise runtime internals (the nightly full run + perry's
+   integration tests cover that interaction). Fix: `ci_test_scope.py` no longer
+   fans *into* `perry-ext-*` / perry-stdlib (`_is_fanout_leaf`); a direct change
+   to one still selects it. A perry-runtime change now selects 4 crates (perry,
+   perry-ffi, perry-runtime, perry-updater) instead of ~50.
+
+Net: per-PR cargo-test on a perry-runtime/codegen/hir change runs ~12 core-crate
+unit-test suites per-package, validated locally green in ~2 min warm.
+
 ## v0.5.1186 — fix(ci): per-PR cargo-test link-OOM — serialize fast-path links + skip zero-unit-test crates
 
 The #5411 fast per-PR path built every affected crate's unit-test binary in one
diff --git a/CLAUDE.md b/CLAUDE.md
index 14e4f69a4..db98aee68 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -8,7 +8,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 Perry is a native TypeScript compiler written in Rust that compiles TypeScript source code directly to native executables. It uses SWC for TypeScript parsing and LLVM for code generation.
 
-**Current Version:** 0.5.1186
+**Current Version:** 0.5.1187
 
 
 ## TypeScript Parity Status
diff --git a/Cargo.lock b/Cargo.lock
index e6762a47d..52a4335a7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -5283,7 +5283,7 @@ checksum = "9b4f627cb1b25917193a259e49bdad08f671f8d9708acfd5fe0a8c1455d87220"
 
 [[package]]
 name = "perry"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "anyhow",
  "base64",
@@ -5340,14 +5340,14 @@ dependencies = [
 
 [[package]]
 name = "perry-api-manifest"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "serde",
 ]
 
 [[package]]
 name = "perry-audio-miniaudio"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "cc",
  "libc",
@@ -5355,7 +5355,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "anyhow",
  "log",
@@ -5370,7 +5370,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-arkts"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "anyhow",
  "perry-hir",
@@ -5379,7 +5379,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-glance"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "anyhow",
  "perry-hir",
@@ -5387,7 +5387,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-js"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "anyhow",
  "perry-dispatch",
@@ -5397,7 +5397,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-swiftui"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "anyhow",
  "perry-hir",
@@ -5406,7 +5406,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-wasm"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "anyhow",
  "base64",
@@ -5419,7 +5419,7 @@ dependencies = [
 
 [[package]]
 name = "perry-codegen-wear-tiles"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "anyhow",
  "perry-hir",
@@ -5427,7 +5427,7 @@ dependencies = [
 
 [[package]]
 name = "perry-container-compose"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -5456,14 +5456,14 @@ dependencies = [
 
 [[package]]
 name = "perry-container-e2e"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "anyhow",
 ]
 
 [[package]]
 name = "perry-diagnostics"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "serde",
  "serde_json",
@@ -5471,7 +5471,7 @@ dependencies = [
 
 [[package]]
 name = "perry-dispatch"
-version = "0.5.1186"
+version = "0.5.1187"
 
 [[package]]
 name = "perry-doc-fixture-my-bindings"
@@ -5482,7 +5482,7 @@ dependencies = [
 
 [[package]]
 name = "perry-doc-tests"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "anyhow",
  "clap",
@@ -5497,14 +5497,14 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-ads"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ffi",
 ]
 
 [[package]]
 name = "perry-ext-argon2"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "argon2",
  "perry-ffi",
@@ -5512,7 +5512,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-axios"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ffi",
  "reqwest",
@@ -5521,7 +5521,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-bcrypt"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "bcrypt",
  "perry-ffi",
@@ -5529,7 +5529,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-better-sqlite3"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ffi",
  "rusqlite",
@@ -5537,7 +5537,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-cheerio"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ffi",
  "scraper",
@@ -5545,7 +5545,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-commander"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ffi",
  "perry-runtime",
@@ -5553,7 +5553,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-cron"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "chrono",
  "cron 0.16.0",
@@ -5563,7 +5563,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-dayjs"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "chrono",
  "perry-ffi",
@@ -5571,7 +5571,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-decimal"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ffi",
  "rust_decimal",
@@ -5579,7 +5579,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-dotenv"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ffi",
  "serde_json",
@@ -5587,7 +5587,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-ethers"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ffi",
  "rand 0.8.6",
@@ -5595,7 +5595,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-events"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ffi",
  "perry-runtime",
@@ -5603,14 +5603,14 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-exponential-backoff"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ffi",
 ]
 
 [[package]]
 name = "perry-ext-fastify"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "bytes",
  "http-body-util",
@@ -5627,7 +5627,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-fetch"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "lazy_static",
  "perry-ffi",
@@ -5639,7 +5639,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-http"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "lazy_static",
  "perry-ext-http-server",
@@ -5652,7 +5652,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-http-server"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "bytes",
  "h2",
@@ -5675,7 +5675,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-ioredis"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "lazy_static",
  "perry-ffi",
@@ -5685,7 +5685,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-jsonwebtoken"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "base64",
  "jsonwebtoken",
@@ -5696,7 +5696,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-lru-cache"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "lru",
  "perry-ffi",
@@ -5704,7 +5704,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-moment"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "chrono",
  "perry-ffi",
@@ -5712,7 +5712,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-mongodb"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "bson",
  "futures-util",
@@ -5724,7 +5724,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-mysql2"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "chrono",
  "perry-ffi",
@@ -5734,7 +5734,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-nanoid"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "nanoid",
  "perry-ffi",
@@ -5743,7 +5743,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-net"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ffi",
  "perry-runtime",
@@ -5755,7 +5755,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-nodemailer"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "lettre",
  "perry-ffi",
@@ -5765,7 +5765,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-pdf"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ffi",
  "printpdf",
@@ -5773,7 +5773,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-pg"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ffi",
  "sqlx",
@@ -5782,7 +5782,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-ratelimit"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "governor",
  "perry-ffi",
@@ -5790,7 +5790,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-sharp"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "base64",
  "image",
@@ -5799,14 +5799,14 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-slugify"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ffi",
 ]
 
 [[package]]
 name = "perry-ext-streams"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "lazy_static",
  "perry-ffi",
@@ -5815,7 +5815,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-uuid"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ffi",
  "uuid",
@@ -5823,7 +5823,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-validator"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ffi",
  "regex",
@@ -5833,7 +5833,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-ws"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "futures-util",
  "lazy_static",
@@ -5845,7 +5845,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ext-zlib"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "brotli",
  "flate2",
@@ -5854,7 +5854,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ffi"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "dashmap",
  "once_cell",
@@ -5863,7 +5863,7 @@ dependencies = [
 
 [[package]]
 name = "perry-hir"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "anyhow",
  "perry-api-manifest",
@@ -5881,7 +5881,7 @@ dependencies = [
 
 [[package]]
 name = "perry-parser"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "anyhow",
  "perry-diagnostics",
@@ -5893,7 +5893,7 @@ dependencies = [
 
 [[package]]
 name = "perry-runtime"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "anyhow",
  "base64",
@@ -5926,7 +5926,7 @@ dependencies = [
 
 [[package]]
 name = "perry-stdlib"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "aes 0.8.4",
  "aes-gcm",
@@ -6018,7 +6018,7 @@ dependencies = [
 
 [[package]]
 name = "perry-transform"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "anyhow",
  "perry-hir",
@@ -6028,7 +6028,7 @@ dependencies = [
 
 [[package]]
 name = "perry-types"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "anyhow",
  "thiserror 1.0.69",
@@ -6036,14 +6036,14 @@ dependencies = [
 
 [[package]]
 name = "perry-ui"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ui-model",
 ]
 
 [[package]]
 name = "perry-ui-android"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "base64",
  "itoa",
@@ -6060,7 +6060,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-geisterhand"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "rand 0.8.6",
  "serde",
@@ -6070,7 +6070,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-gtk4"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "base64",
  "cairo-rs",
@@ -6093,7 +6093,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-ios"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "base64",
  "block2",
@@ -6109,7 +6109,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-macos"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "base64",
  "block2",
@@ -6124,7 +6124,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-model"
-version = "0.5.1186"
+version = "0.5.1187"
 
 [[package]]
 name = "perry-ui-test"
@@ -6132,11 +6132,11 @@ version = "0.1.0"
 
 [[package]]
 name = "perry-ui-testkit"
-version = "0.5.1186"
+version = "0.5.1187"
 
 [[package]]
 name = "perry-ui-tvos"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "base64",
  "block2",
@@ -6152,7 +6152,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-visionos"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "base64",
  "block2",
@@ -6168,7 +6168,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-watchos"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "block2",
  "libc",
@@ -6181,7 +6181,7 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-windows"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "base64",
  "libc",
@@ -6198,14 +6198,14 @@ dependencies = [
 
 [[package]]
 name = "perry-ui-windows-winui"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "perry-ui-windows",
 ]
 
 [[package]]
 name = "perry-updater"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "base64",
  "ed25519-dalek",
@@ -6219,7 +6219,7 @@ dependencies = [
 
 [[package]]
 name = "perry-wasm-host"
-version = "0.5.1186"
+version = "0.5.1187"
 dependencies = [
  "wasmi",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 3de0fc748..26fda6ef3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -215,7 +215,7 @@ strip = false
 codegen-units = 16
 
 [workspace.package]
-version = "0.5.1186"
+version = "0.5.1187"
 edition = "2021"
 license = "MIT"
 repository = "https://github.com/PerryTS/perry"
diff --git a/scripts/ci_test_scope.py b/scripts/ci_test_scope.py
index 6b742198c..a39be9117 100755
--- a/scripts/ci_test_scope.py
+++ b/scripts/ci_test_scope.py
@@ -102,8 +102,26 @@ def _runtime_link_augment(seeds):
     return augmented
 
 
+def _is_fanout_leaf(name):
+    """Crates we never fan *into* when a dependency changes.
+
+    `perry-ext-*` and `perry-stdlib` are runtime FFI shims whose UNIT tests are
+    self-contained pure-Rust logic — they do not exercise perry-runtime internals,
+    so a perry-runtime change need not re-run them per-PR (the nightly full run +
+    perry's integration tests cover that interaction). Excluding them from the
+    reverse-dep fan-out keeps a foundational change from selecting ~40 crates, and
+    avoids perry-runtime feature-unification rebuilds. A direct change *to* one of
+    these crates still selects it (it starts as a seed).
+    """
+    return name == "perry-stdlib" or name.startswith("perry-ext-")
+
+
 def _reverse_dep_closure(md, seeds):
-    """All workspace members that transitively depend on any package in `seeds`."""
+    """All workspace members that transitively depend on any package in `seeds`.
+
+    Fan-out skips `_is_fanout_leaf` crates (they are not added as dependents and
+    are not traversed), so a foundational change does not pull in every FFI shim.
+    """
     members = {p["name"] for p in md["packages"]}
     # revdeps[x] = packages that directly depend on x
     revdeps = {}
@@ -116,9 +134,10 @@ def _reverse_dep_closure(md, seeds):
     while stack:
         cur = stack.pop()
         for dependent in revdeps.get(cur, ()):
-            if dependent not in affected:
-                affected.add(dependent)
-                stack.append(dependent)
+            if dependent in affected or _is_fanout_leaf(dependent):
+                continue
+            affected.add(dependent)
+            stack.append(dependent)
     return affected