https://git.ruby-lang.org/ruby.git/commit/?id=d00e7deb5c

From d00e7deb5c780d75e4edd3afa3e26ea02c296d8c Mon Sep 17 00:00:00 2001
From: Jean Boussier <jean.boussier@g...>
Date: Sat, 23 Jan 2021 10:15:22 +0100
Subject: Use rb_enc_interned_str in ibf_load_object_string

---
 compile.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/compile.c b/compile.c
index 898b02e..ce50168 100644
--- a/compile.c
+++ b/compile.c
@@ -11389,17 +11389,20 @@ ibf_load_object_string(const struct ibf_load *load, const struct ibf_object_head https://github.com/ruby/ruby/blob/trunk/compile.c#L11389
     const long len = (long)ibf_load_small_value(load, &reading_pos);
     const char *ptr = load->current_buffer->buff + reading_pos;
 
-    VALUE str = rb_str_new(ptr, len);
-
     if (encindex > RUBY_ENCINDEX_BUILTIN_MAX) {
         VALUE enc_name_str = ibf_load_object(load, encindex - RUBY_ENCINDEX_BUILTIN_MAX);
         encindex = rb_enc_find_index(RSTRING_PTR(enc_name_str));
     }
-    rb_enc_associate_index(str, encindex);
 
-    if (header->internal) rb_obj_hide(str);
-    if (header->frozen)   str = rb_fstring(str);
+    VALUE str;
+    if (header->frozen && !header->internal) {
+        str = rb_enc_interned_str(ptr, len, rb_enc_from_index(encindex));
+    } else {
+        str = rb_enc_str_new(ptr, len, rb_enc_from_index(encindex));
 
+        if (header->internal) rb_obj_hide(str);
+        if (header->frozen)   str = rb_fstring(str);
+    }
     return str;
 }
 
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