From e02eda194f1d1ff6998b5eb462dd2a2afc54281c Mon Sep 17 00:00:00 2001
From: Luke Gruber <luke.gruber@shopify.com>
Date: Mon, 1 Dec 2025 12:55:39 -0500
Subject: [PATCH] Speedup RBASIC_FIELDS_COUNT (#15273)

We know the argument is not a class, module or special const, so we can
skip these checks.
---
 shape.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/shape.h b/shape.h
index ec5c25b32f..d9cfe48759 100644
--- a/shape.h
+++ b/shape.h
@@ -395,7 +395,7 @@ ROBJECT_FIELDS_COUNT(VALUE obj)
 static inline uint32_t
 RBASIC_FIELDS_COUNT(VALUE obj)
 {
-    return RSHAPE(rb_obj_shape_id(obj))->next_field_index;
+    return RSHAPE(RBASIC_SHAPE_ID(obj))->next_field_index;
 }
 
 static inline bool