https://git.ruby-lang.org/ruby.git/commit/?id=b7fa78b0f3

From b7fa78b0f3c42d698aff7d6003d839febcbb4740 Mon Sep 17 00:00:00 2001
From: Jean Boussier <jean.boussier@g...>
Date: Thu, 8 Sep 2022 14:07:43 +0200
Subject: vm_objtostring: skip method lookup for T_STRING receivers

We don't need it, and in string interpolation context
that's the common case.
---
 vm_insnhelper.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 9ccfdff4a0..c68872a9bf 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -4851,11 +4851,14 @@ VALUE rb_mod_name(VALUE); https://github.com/ruby/ruby/blob/trunk/vm_insnhelper.c#L4851
 static VALUE
 vm_objtostring(const rb_iseq_t *iseq, VALUE recv, CALL_DATA cd)
 {
+    int type = TYPE(recv);
+    if (type == T_STRING) {
+        return recv;
+    }
+
     const struct rb_callcache *cc = vm_search_method((VALUE)iseq, cd, recv);
 
-    switch (TYPE(recv)) {
-      case T_STRING:
-        return recv;
+    switch (type) {
       case T_SYMBOL:
         if (check_cfunc(vm_cc_cme(cc), rb_sym_to_s)) {
             // rb_sym_to_s() allocates a mutable string, but since we are only
-- 
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