Materializing the checked view of a JavaScript class instance copies its
property bag through scr_dyn_copy_property_descriptors, which built a key
string and a descriptor object per property and defined each through
scr_dyn_define_property (about 2k instructions per property). Plain objects
on both sides now copy each entry directly with the attributes, value or
accessor pair and own-key order the definition gives; properties the target
already has, non-extensible targets and other receivers keep the general
path.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
