Preserve Octal format in YAML 1.1 docs

2 files changed, 10 insertions, 2 deletions

diff --git a/constructor.py b/constructor.py
index 6aa6371..a67ca55 100644
--- a/constructor.py
+++ b/constructor.py
@@ -1148,7 +1148,12 @@ class RoundTripConstructor(SafeConstructor):
                 anchor=node.anchor,
             )
         elif self.resolver.processing_version != (1, 2) and value_s[0] == '0':
-            return sign * int(value_s, 8)
+            return OctalInt(
+                sign * int(value_s, 8),
+                width=width,
+                underscore=underscore,
+                anchor=node.anchor,
+            )
         elif self.resolver.processing_version != (1, 2) and ':' in value_s:
             digits = [int(part) for part in value_s.split(':')]
             digits.reverse()
diff --git a/representer.py b/representer.py
index 820559b..c57d9aa 100644
--- a/representer.py
+++ b/representer.py
@@ -634,7 +634,10 @@ class RoundTripRepresenter(SafeRepresenter):
         else:
             s = format(data, 'o')
         anchor = data.yaml_anchor(any=True)
-        return self.insert_underscore('0o', s, data._underscore, anchor=anchor)
+        prefix = '0o'
+        if getattr(self.serializer, 'use_version', None) == (1, 1):
+            prefix = '0'
+        return self.insert_underscore(prefix, s, data._underscore, anchor=anchor)
 
     def represent_hex_int(self, data):
         # type: (Any) -> Any