* Use same "proxy rejected" for all Proxy invariant rejects.
* #ifdef guard for proxy policy checks.
* Test coverage for 'preventExtensions' trap.
* Convert many duk_hobject.h macro calls into function calls.
* Add functions to interact with idx_props allocation.
* Compile warning fixes.
* Fix Proxy.revocable() revoker function .name and .length properties
(empty name, 0 length).
* Summarize a revoked proxy as '[object RevokedProxy]' in internal readable
summary string, and add test coverage.
* Rename internal duk_push_class_string() as duk_push_objproto_tostring()
for clarity, the helper has Object.prototype.toString() semantics
(except when avoid_side_effects = 1).
* Fix duk_push_objproto_tostring() behavior for revoked Proxies, required
behavior is to throw (this happens in the @@toStringTag lookup which is
unconditional).
* Rename duk_get_top_index_unsafe() -> duk_get_top_index_known() for clarity.
* Add more duk_get_top_index_known() call sites when value stack is known
to have >= 1 entries.
* Rename duk_pop_unsafe() and variants to duk_pop_known() which is more
descriptive.
* Use duk_push_{undefined,tval}_unsafe() instead of direct valstack_top
manipulation in executor and a few other places.
* Add test coverage for chained Proxies in call setup.
* Minor code improvements.
* Implement Proxy.revocable() and add test case coverage for some
Proxy revocation basics.
* Fix revoked Proxy handling in instanceof and Array.isArray(), and
add test coverage.
* Fix revoked Proxy handling in call setup, and add test coverage.
Chained Proxies still not supported in call handling.
* Add stack top asserts for internal duk_prop_xxx.c file APIs:
defown, delete, enum, get, getown, has, ownpropkeys, set.
* Fix unused duk_hobject layouts from property table init code
in src-tools.
* Finalize debug log support for pointer compressed builds. Pointer
compressed builds can now debug log.
* Fix refcount leak in Uint8Array 'get'.
* Fix assertion failure (and underlying bug) for chained Proxy.
* Fix build failure when using assertions and no refcounts.
* Add stack top entry/exit assertions to duk_prop_get.c and
duk_prop_getown.c.
Isolate all char-offset-to-byte-offset and character access calls
behind helpers to help prepare for a switch to WTF-8 representation.
This change should have no visible effect yet.
Rename duk_is_null_or_undefined() to duk_is_nullish() to better match
current ECMAScript terminology. Keep duk_is_null_or_undefined() as a
deprecated API macro. Add internal DUK_TVAL_IS_NULLISH().
Sami Vaarala