https://codereview.chromium.org/1157453002/diff/1/src/bootstrapper.cc
File src/bootstrapper.cc (right):
https://codereview.chromium.org/1157453002/diff/1/src/bootstrapper.cc#newcode1221
src/bootstrapper.cc:1221:
native_context()->set_js_map_map(js_map_fun->initial_map());
this doesn't work :-/
the prototype of the Map() function is overwritten in collection.js
which runs after this code.
if you built without a snapshot and create a Map via the C++ API, the
resulting object's __proto__ will be Object.prototype
you should store the function in the native context, and read the
initial map in ConfigureGlobalObjects
https://codereview.chromium.org/1157453002/
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