152710 2016-01-04 12:59:41 -0800 Subclassing builtins should create a new structure and cache it rather than transitioning. 2016-01-27 14:37:13 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED DUPLICATE 152942 P2 Normal --- 1 keith_miller webkit-unassigned oldest_to_newest 1152469 0 keith_miller 2016-01-04 12:59:41 -0800 We should not transition the structure each time we want to make a structure with a non-BuiltinConstructor.prototype prototype. Instead we should make a new structure and cache it for next time. 1159436 1 keith_miller 2016-01-27 14:37:13 -0800 *** This bug has been marked as a duplicate of bug 152942 ***