From c08bd25dfa3b11772b437692444c59074f1aa4d9 Mon Sep 17 00:00:00 2001
From: Adam Wight <adam.wight@wikimedia.de>
Date: Wed, 12 Jul 2023 15:42:39 -0700
Subject: [PATCH 1/2] Quote values with an initial ":{"

This combination is parsed as syntax by yamlerl and possibly other
decoders, so we should quote when emitting for better compatibility.
---
 lib/ymlr/encode.ex        | 1 +
 test/ymlr/encode_test.exs | 1 +
 2 files changed, 2 insertions(+)

diff --git a/lib/ymlr/encode.ex b/lib/ymlr/encode.ex
index 3e45c52..6f0a1b0 100644
--- a/lib/ymlr/encode.ex
+++ b/lib/ymlr/encode.ex
@@ -158,6 +158,7 @@ defmodule Ymlr.Encode do
       String.at(data, -1) in @quote_when_last -> with_quotes(data)
       String.starts_with?(data, "- ") -> with_quotes(data)
       String.starts_with?(data, ": ") -> with_quotes(data)
+      String.starts_with?(data, ":{") -> with_quotes(data)
       String.starts_with?(data, "? ") -> with_quotes(data)
       String.contains?(data, " #") -> with_quotes(data)
       String.contains?(data, ": ") -> with_quotes(data)
diff --git a/test/ymlr/encode_test.exs b/test/ymlr/encode_test.exs
index 13c16d1..7f094af 100644
--- a/test/ymlr/encode_test.exs
+++ b/test/ymlr/encode_test.exs
@@ -53,6 +53,7 @@ defmodule Ymlr.EncodeTest do
       assert MUT.to_s!("? explicit mapping key") == ~S('? explicit mapping key')
       assert MUT.to_s!("{flow_mapping") == ~S('{flow_mapping')
       assert MUT.to_s!("}flow_mapping") == ~S('}flow_mapping')
+      assert MUT.to_s!(":{ block flow") == ~S(':{ block flow')
       assert MUT.to_s!("[sequence_mapping") == ~S('[sequence_mapping')
       assert MUT.to_s!("]sequence_mapping") == ~S(']sequence_mapping')
 

From 0884859361ba33597ad560a18b6c2a1e63521a05 Mon Sep 17 00:00:00 2001
From: Adam Wight <adam.wight@wikimedia.de>
Date: Wed, 12 Jul 2023 15:48:04 -0700
Subject: [PATCH 2/2] Add changelog entry

---
 CHANGELOG.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index dc60de8..ec07234 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 <!-- ### Added | Changed | Deprecated | Removed | Fixed | Security -->
 
+### Added
+
+- Quote values beginning with `:{`
+
 <!--------------------- Don't add new entries after this line --------------------->
 
 ## [4.1.0] - 2023-04-23