Bugs:- modules: better error handling with cyclic module references Misc ideas:- use custom printf to avoid compatibility issues with floating point numbers- consistent naming for preprocessor defines- unify coding style and naming conventions- use names from the ECMA spec in library implementation- use byte code emitters with typed arguments (for clarity)- use 2 bytecode DynBufs in JSFunctionDef, one for reading, one for writing  and use the same wrappers in all phases- use more generic method for line numbers in resolve_variables and resolve_labels- use custom timezone support to avoid C library compatibility issues Memory:- use memory pools for objects, etc?- test border cases for max number of atoms, object properties, string length- add emergency malloc mode for out of memory exceptions.- test all DynBuf memory errors- test all js_realloc memory errors- improve JS_ComputeMemoryUsage() with more info Built-in standard library:- BSD sockets- modules: use realpath in module name normalizer and put it in quickjs-libc- modules: if no ".", use a well known module loading path ?- get rid of __loadScript, use more common name REPL:- debugger- readline: support MS Windows terminal- readline: handle dynamic terminal resizing- readline: handle double width unicode characters- multiline editing- runtime object and function inspectors- interactive object browser- use more generic approach to display evaluation results- improve directive handling: dispatch, colorize, completion...- save history- close all predefined methods in repl.js and jscalc.js Optimization ideas:- 64-bit atoms in 64-bit mode ?- 64-bit small bigint in 64-bit mode ?- reuse stack slots for disjoint scopes, if strip- add heuristic to avoid some cycles in closures- small String (0-2 charcodes) with immediate storage- perform static string concatenation at compile time- optimize string concatenation with ropes or miniropes?- add implicit numeric strings for Uint32 numbers?- optimize `s += a + b`, `s += a.b` and similar simple expressions- ensure string canonical representation and optimise comparisons and hashes?- remove JSObject.first_weak_ref, use bit+context based hashed array for weak references- property access optimization on the global object, functions,  prototypes and special non extensible objects.- create object literals with the correct length by backpatching length argument- remove redundant set_loc_uninitialized/check_uninitialized opcodes- peephole optim: push_atom_value, to_propkey -> push_atom_value- peephole optim: put_loc x, get_loc_check x -> set_loc x- convert slow array to fast array when all properties != length are numeric- optimize destructuring assignments for global and local variables- implement some form of tail-call-optimization- optimize OP_apply- optimize f(...b) Test262o:   0/11262 errors, 463 excludedTest262o commit: 7da91bceb9ce7613f87db47ddd1292a2dda58b42 (es5-tests branch) Result: 51/75119 errors, 899 excluded, 570 skippedTest262 commit: 1c33fdb0ca60fb9d7392403be769ed0d26209132