Node 0.12 was released and ships with v8 3.28.73. Most (if not all) of the bug reports you cite refer to needing NAN 1.5 which fixes issues with v8 > 3.28. NAN is used by both io.js modules AND node.js modules.

Both io.js and node.js 0.12 have a v8 > 3.28. All those modules are also broken in Node 0.12 because the underlying v8 API changed.

As pointed out by others, the node.js tests are only passing because some last minute shenanigans so they could claim all their tests were passing "but io.js' tests are not."

Compiled modules are generally more tied to the version of V8 that node/iojs is bound to, depending on that library's interface needs. This is why many libraries are written, rewritten and using javascript-only, so that they can run everywhere. For that matter, many compiled modules didn't work right in windows until well after 0.10 was first released, and some still don't.