@@ -187,7 +187,8 @@ jobs:
           fetch-depth: 0
           ref: ${{ github.ref }}
 
-      - env:
+      - name: Switch to the head branch
+        env:
           BRANCH: ${{ github.head_ref || github.ref_name }}
         run: git switch -C "$BRANCH"
 
@@ -221,7 +222,8 @@ jobs:
           fetch-depth: 0
           ref: ${{ github.ref }}
 
-      - env:
+      - name: Switch to the head branch
+        env:
           BRANCH: ${{ github.ref_name }}
         run: git switch -C "$BRANCH"
 
 
@@ -106,6 +106,8 @@ def entry_to_string(self, hdr: str, other: bytes | str | None) -> str:
 
 
 class DNSQuestion(DNSEntry):
+    """A question a resolver asks about a name."""
+
     __slots__ = ("_hash",)
 
     def __init__(self, name: str, type_: int, class_: int) -> None:
@@ -232,6 +234,8 @@ def to_string(self, other: bytes | str) -> str:
 
 
 class DNSAddress(DNSRecord):
+    """Record holding an IPv4 or IPv6 address."""
+
     __slots__ = ("_hash", "address", "scope_id")
 
     def __init__(
@@ -338,6 +342,8 @@ def __repr__(self) -> str:
 
 
 class DNSPointer(DNSRecord):
+    """PTR record naming a service instance."""
+
     __slots__ = ("_hash", "alias", "alias_key")
 
     def __init__(
@@ -389,6 +395,8 @@ def __repr__(self) -> str:
 
 
 class DNSText(DNSRecord):
+    """TXT record carrying the service properties."""
+
     __slots__ = ("_hash", "text")
 
     def __init__(
@@ -431,6 +439,8 @@ def __repr__(self) -> str:
 
 
 class DNSService(DNSRecord):
+    """SRV record with the target host, port, priority and weight."""
+
     __slots__ = ("_hash", "port", "priority", "server", "server_key", "weight")
 
     def __init__(
 
@@ -29,6 +29,16 @@ def teardown_module():
 
 
 class Names(unittest.TestCase):
+    def test_long_name(self):
+        generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
+        question = r.DNSQuestion(
+            "an.excessively.deep.chain.of.dns.labels.used.for.testing.local.",
+            const._TYPE_SRV,
+            const._CLASS_IN,
+        )
+        generated.add_question(question)
+        r.DNSIncoming(generated.packets()[0])
+
     def test_exceedingly_long_name(self):
         generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
         name = f"{'part.' * 1000}local."