1Misc:
2- use realpath in module name normalizer and put it in quickjs-libc
3- use custom printf to avoid C library compatibility issues
4- rename CONFIG_ALL_UNICODE, CONFIG_BIGNUM, CONFIG_ATOMICS, CONFIG_CHECK_JSVALUE ?
5- unify coding style and naming conventions
6- use names from the ECMA spec in library implementation
7- modules: if no ".", use a well known module loading path ?
8- use JSHoistedDef only for global variables (JSHoistedDef.var_name != JS_ATOM_NULL)
9- add index in JSVarDef and is_arg flag to merge args and vars in JSFunctionDef
10- replace most JSVarDef flags with var_type enumeration
11- use byte code emitters with typed arguments (for clarity)
12- use 2 bytecode DynBufs in JSFunctionDef, one for reading, one for writing
13  and use the same wrappers in all phases
14- use more generic method for line numbers in resolve_variables and resolve_labels
15- use custom timezone support to avoid C library compatibility issues
16
17Memory:
18- test border cases for max number of atoms, object properties, string length
19- add emergency malloc mode for out of memory exceptions.
20- test all DynBuf memory errors
21- test all js_realloc memory errors
22- bignum: handle memory errors
23- use memory pools for objects, etc?
24- improve JS_ComputeMemoryUsage() with more info
25
26Optimizations:
27- 64-bit atoms in 64-bit mode ?
28- use auto-init properties for more global objects
29- reuse stack slots for disjoint scopes, if strip
30- optimize `for of` iterator for built-in array objects
31- add heuristic to avoid some cycles in closures
32- small String (0-2 charcodes) with immediate storage
33- perform static string concatenation at compile time
34- optimize string concatenation with ropes or miniropes?
35- add implicit numeric strings for Uint32 numbers?
36- optimize `s += a + b`, `s += a.b` and similar simple expressions
37- ensure string canonical representation and optimise comparisons and hashes?
38- remove JSObject.first_weak_ref, use bit+context based hashed array for weak references
39- optimize function storage with length and name accessors?
40- property access optimization on the global object, functions,
41  prototypes and special non extensible objects.
42- create object literals with the correct length by backpatching length argument
43- remove redundant set_loc_uninitialized/check_uninitialized opcodes
44- peephole optim: push_atom_value, to_propkey -> push_atom_value
45- peephole optim: put_loc x, get_loc_check x -> set_loc x
46- comparative performance benchmark
47- use variable name when throwing uninitialized exception if available
48- convert slow array to fast array when all properties != length are numeric
49- optimize destructuring assignments for global and local variables
50- implement some form of tail-call-optimization
51- optimize OP_apply
52- optimize f(...b)
53
54Extensions:
55- support more features in [features] section
56- add built-in preprocessor in compiler, get rid of jscompress
57  handle #if, #ifdef, #line, limited support for #define
58- get rid of __loadScript, use more common name
59- BSD sockets
60
61REPL:
62- debugger
63- readline: support MS Windows terminal
64- readline: handle dynamic terminal resizing
65- readline: handle double width unicode characters
66- multiline editing
67- runtime object and function inspectors
68- interactive object browser
69- use more generic approach to display evaluation results
70- improve directive handling: dispatch, colorize, completion...
71- save history
72- close all predefined methods in repl.js and jscalc.js
73
74Test262o:   0/11262 errors, 463 excluded
75Test262o commit: 7da91bceb9ce7613f87db47ddd1292a2dda58b42 (es5-tests branch)
76
77Test262: 30/71095 errors, 870 excluded, 549 skipped
78Test262 commit: 281eb10b2844929a7c0ac04527f5b42ce56509fd
79