merge revision(s) e04146129ec6898dd6a9739dad2983c6e9b68056, d5080f6e8b77364483ff6727b1065e45e180f05d: [Backport #20292]

	[Bug #20292] Truncate embedded string to new capacity

	Fix -Wsign-compare on String#initialize
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	../string.c:1886:57: warning: comparison of integer expressions of different signedness: ‘size_t’ {aka ‘long unsigned int’} and ‘long int’ [-Wsign-compare]
	 1886 |                 if (STR_EMBED_P(str)) RUBY_ASSERT(osize <= str_embed_capa(str));
	      |                                                         ^~

1 files changed, 7 insertions, 0 deletions

diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index 24527a527f..3a2cc6b4a7 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -80,6 +80,13 @@ class TestString < Test::Unit::TestCase
     assert_equal("mystring", str.__send__(:initialize, "mystring", capacity: 1000))
     str = S("mystring")
     assert_equal("mystring", str.__send__(:initialize, str, capacity: 1000))
+
+    if @cls == String
+      100.times {
+        "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa".
+          __send__(:initialize, capacity: -1)
+      }
+    end
   end
 
   def test_initialize_shared