A dynamic-tier property site tested only the first entry of its cache
inline and called scr_js_get_probe (or scr_js_store_probe) for anything
else. A site that sees two layouts, such as object literals of one
record built in two key orders, then took the out-of-line probe on
every access to objects of its second layout.
Sites now test the first two entries inline, own or prototype, for
reads and replacing writes. The probe still answers the third and fourth
entries, misses and everything that is not plain data.
Chris Tate
6beed6cb01